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This 13-inch MacBook has been modded into tablet form.

With all the crystal-ball-watching over the seemingly imminent Apple tablet, one issue hotly debated around the CNET offices, but infrequently mentioned elsewhere, is the hypothetical device's status as a mobile computer.

There are two schools of thought on this: either the Apple tablet (or iSlate, or whatever it ends up being called) will be a 10-or-so-inch tablet PC with a full Mac OS X operating system; or it will merely be a larger-screen version of the current iPod Touch, which has a closed, limited phone-like OS.

The former would mean it could very likely run any software you'd run on a MacBook, from Firefox to Photoshop, and maybe even install Windows 7 via Boot Camp or Parallels. The later points to a hermetically sealed ecosystem, where apps would have to be approved and sold through an official app store (as in iTunes).

Time to play with your new toy.

(Credit: Corinne Schulze/CNET)

If an iPhone awaited you under the tree this Christmas, we understand if you're a bit excited. Reception woes aside, the iPhone is a remarkable device in many respects. It offers a great multimedia experience, efficient e-mail integration, a spiffy Web browser, and thousands of third-party apps that do everything from helping you choose a seat on an airplane to guiding your way to the airport. And now that it has multimedia messaging, we're no longer waiting for any basic cell phone features. Granted, those pesky network issues won't go away soon, but you may get lucky and have no problems. And even if you do, at least you have a shiny new gadget, right?

If you've never used an iPhone before, getting started can be a bit overwhelming. With so many apps and accessories available, it's not easy to separate the wheat from the chaff. And even if you're a veteran iPhone user who's graduating to the newest model, exercising discretion, particularly when purchasing apps, is wise. You might say, "It's just 99 cents!" but 99 cents multiplied scores of times can result in a hefty iTunes bill. ... Read more

The Need for Speed series returns to the iPhone with NFS:Shift.

(Credit: Screenshot by Antuan Goodwin/CNET)

Need for Speed SHIFT for iPhone (photos)

EA Mobile has released the second iPhone game in the Need for Speed series: Need for Speed Shift.

You may remember that we took a look at Need for Speed Undercover not too long ago and found it was a fun, arcadelike take on racing with a decent number of fully customizable vehicles. Shift is an evolution of that game but with more realistic racing physics in place of the hokey storyline. Also new to Shift are customizable racing views. Users can now select between chase-cam, hood-cam, bumper-cam, and cockpit views. The cockpit view is unique to the vehicle you're driving, but unfortunately there are no working gauges. The cockpit view is also the only view that features damage modeling in the form of a windshield that gets more messed up the as you hit things.

This Nissan Z features an accurate interior, but no working gauges.

(Credit: Screenshot by Antuan Goodwin/CNET)

On your first outing with Shift, you'll be treated to a quick tutorial that teaches you how to drive with an iPhone. Shift pretty much plays like Undercover, but with a few key differences. Its steering is still controlled by tilting. The vehicles still auto-accelerate and brake when the screen is tapped. However, the race-breaker, slow-motion feature is gone and the controls are supposedly more realistic. In practice, this means that you can no longer win races without touching the brakes and that the transmission is now manual, which can be frustrating for novice users who just want to drive.

Fortunately, there are driver aids that can be activated that automatically brake and shift for you and assist steering that make your ham-fisted inputs smoother and more accurate. Users who want an easy to play, arcade-style racer can turn on the driving aids and win a few medals on the bus ride to work; and users who want more of a racing-sim experience can set all systems to manual for more control over the game. Driving aids or not, drifting is maddeningly difficult this time around. I prefer the drifting mechanics of Undercover.

(Credit: Dan Ackerman )

As someone who moves into a new laptop a couple of times per week on average, I'd like to think I know a thing or two about getting a PC optimally set up. For more than a year now, I've carried a USB key on my keychain (most recently the excellent LaCie Iamakey), containing a folder of install files for apps I know I'm going to want to have on whatever laptop I'm reviewing at the moment.

While you're probably setting up only one new desktop or laptop this holiday season (or maybe more if you're the unofficial family IT guy), it makes sense to have a checklist of apps, especially free ones, that should be installed on any new PC.

Check out the slideshow below to see my personal list of apps I keep on my USB key, or give us your suggestions in the comments section below.

New PC survival kit: download these free apps on day one

> Need more? Follow me at twitter.com/danackerman.
> See our Holiday laptop picks in the CNET Holiday Tech Guide.
> Everything you need to know about buying a laptop.

The Twitter app for the Zune HD is functional, elegant, and free.

(Credit: Donald Bell/CNET)

I've spent only a few minutes with the app, but I feel declaring it as a welcome addition to the slowly growing roster of free apps for the Zune HD.

Will it blow your mind? Probably not. But as an officially sanctioned Twitter-branded app, users are given a very familiar, clean, and intuitive way to read and create tweets.

Power users will probably be a little bummed there isn't a landscape keyboard option or much at all in the way of settings. That said, this is only version 1.0, so don't count out the possibility of updates in the not-too-distant future.

Probably the coolest little surprise is a button that will automatically populate your tweet with the currently playing song's title and artist info. It's not quite as convenient as a Blip.fm link, but it gives you a quick way to announce your love of Afrika Bambaataa without mangling the spelling.

Another detail worth mentioning--there are no in-app ads. I guess since the Twitter app falls under the "utility" category of apps, Microsoft isn't bundling in the banner ads that plague their games. I imagine it'll be the same case for the forthcoming Facebook app, should it ever see the light of day.

To take a closer look at some of the features, check out the photo gallery.

Twitter for Zune HD (screenshots)

(Credit: Microsoft)

Snigger as you will over Microsoft's decision to call Bing, its overhauled search engine, a "decision engine," but those giggles should dissolve when you start up Microsoft's brand-new Bing for iPhone (and iPod Touch). As a search app goes, Bing, which debuted Tuesday in the iTunes App Store, is the real thing.

The Bing app has a slew of expected features, including voice search, maps, directions, search suggestions, and location-awareness. That's no surprise. Besides these being features common to Bing.com and to the Bing application on other mobile platforms, they're also necessary to compete with Google Mobile App for iPhone.

Bing's stylish layout is a pleasant surprise, and one that adds up, screen by screen, to a cohesive search experience. Opening Bing, you see the image of the day as your background (this doesn't appear to be customizable,) with the search field and voice search button at the top of the app. A rounded, six-panel grid of buttons jumps you to Bing's image collection, movie listings, maps, directions, business look-up, and a news feed. A drop-down menu on the search bar lets you filter your searches in all those categories, save directions. The semitransparent navigation strip below has a Home button and back and forward arrows, plus a button to hide the button panel, and an icon that pops up settings to clear your search history, set your search filter, and so on.

Bing gives you directions for your car and for navigating on foot, but it doesn't yet include directions using public transit, as the Google Mobile App does. Bing, however, has a neat feature that lets you swipe a transparent ribbon to advance through each direction, which moves the satellite, hybrid, road, or shaded map along in turn. We like that tapping a search result on the map brings up a tag with ratings and with icons to call the business or launch into directions.

Another difference to keep in mind between Bing and its Google rival is that Bing smashes a map and search app into one, whereas Google's mapping program is also the iPhone's default map app. When you access maps from Google Mobile App, you'll wind up opening up the Maps app for the actual search.

The Bing app for iPhone still isn't complete. As far as we can tell so far, it lacks some of the extras of other mobile Bing apps, like the capability to lay down pushpins on the map and save locations, and the capability to view multiple locations on the map. The absent features in the iPhone app indicate the direction of Microsoft's plans for Bing's growth on iPhone.

While Bing's performance during our initial testing was good, individuals may notice fluctuations based on their data and Wi-Fi connections. There may be other areas where Bing might not match up: for instance, Google claims its iPhone app can detect British and Australian pronunciation in addition to U.S. and Canadian accents. Do our international friends notice parity with Bing's voice search?

Although Bing may not match every bell and whistle that Google Mobile App and Maps apps do combined, Bing 1.0 for iPhone does offer a viable alternative to Google's searching and mapping dominance.

Flower started a big trend in 2009.

(Credit: Thatgamecompany)

In many ways, 2009 seems to be the year download-only games hit their stride. Between the iPhone and iPod Touch dominating the portable market with the ever-growing App Store; the release of the completely disc-free PSP Go; and the Nintendo DSi--which also can download games from an online store--portable gaming has started to move beyond the cartridge and disc. Even in home consoles, there's been a continuing focus on lower-cost downloadable games and DLC sold on Sony's PSN, Microsoft's Xbox Live Arcade, and the Nintendo Wii's WiiWare as alternatives to pricier disc-based titles.

While download-only games can't be resold, and lack a physical hard copy for display or archive, there's no denying that downloadable games cut down on clutter. Plus, it's likely that box-free gaming will be our destiny in the next decade, so you may not have a choice either way.

From Rockstar's double-fisted set of GTA side games culminating in The Ballad of Gay Tony to Nintendo's ongoing set of experimental artsy games, it's been a great year to go boxless. While some of the games on our list are available in disc or cartridge form, we're focusing on the download versions here.

Check out our gallery of the most notable 20, and feel free to chime in on ones we might have missed.

Downloadable Games of 2009 (photos)

Researchers at Johns Hopkins University are throwing their weight behind OsiriX, a medical imaging app that can be used to diagnose acute appendicitis with surprising accuracy.

(Credit: OsiriX)

Just over a year ago, the open-source Mac image viewer OsiriX released its widely hailed medical imaging software for the iPhone. The software was created by a group of radiologists who also proved to be sophisticated programmers, and was hailed by a wider net of radiologists as an app with serious promise.

More recently, scientists from Johns Hopkins University rallied formally behind the app when they presented the results of a study conducted at the University of Virginia in Charlottesville of patients suspected of having acute appendicitis. Reviewing nothing more than computed tomography (CT) scans over an encrypted wireless network using an iPhone 3G with the OsiriX app, researchers were able to diagnose acute appendicitis correctly in 99 percent of the scans of 25 patients, with one false negative.

"This new technology can expedite diagnosis and, therefore, treatment," says Asim Choudhri, a neuroradiologist at JHU who led the study. "We knew that recent advances in handheld device technology allowed viewing of medical imaging, but it [was] unproven whether viewing on a small screen allows a reader to reliably and reproducibly obtain information."

The findings of this study, which Choudhri tells me was funded internally at the UVA Department of Radiology (and yes, his allegiance is clear--he owns an iPhone and in fact supplied it for the study) are encouraging not only for possible appendicitis cases, but a wide range of illnesses such as aneurism and stroke that require fast diagnosis. ... Read more

Bonnie Cha, senior editor for cell phones, joins the show today to fill in for Justin Yu. It's one of the few days Wilson and Jeff aren't worried about losing their jobs for something they shouldn't have said. And no, she is NOT Nicole Lee. What better day to have Ms. Cha on the show than following the weekend that the actual Google phone leaks!

Google Nexus One

(Credit: Cory O'Brien)

The Google phone has been rumored for the last three or four years, and since the release of Google's Android operating system, the hoopla has died down considerably for an actual Google-branded phone. In typical Google fare, the company has decided on screwing its partners like Verizon and Motorola over by releasing an unsubsidized GSM phone called the Nexus One. No word yet on how much the unit will cost, but we do know that HTC designed the device. And that Google employees got the units over the weekend. Word on the street is that the device runs Android OS 2.1.

The mobile space is where all the spice is these days, and today is no different. News comes out that the venerable institution that is Playboy is jumping into the iPhone app fray with its own app. Because of Steve Jobs' no-porn rule, however, the app won't come with any outright nude pics. It will come with some scantily clad ladies and their interests. Per usual, it's all about the articles, not the pics.

(Credit: Playboy)

In videogaming news, the Pentagon is buying up 2,200 PlayStation 3s. No, they aren't using it to train soldiers with "Call of Duty: Modern Warfare 2", while it may be a lot of fun. The military wants to use the gaming consoles to run simulations because the $299 machines can calculate 150 GFLOPS. At The 404, we really have no idea what that means, but it sounds impressive.

Finally, Green Day comes to Rock Band. The Beatles have come already, and while we're generally excited to have one of the best modern bands, we're not really excited to have every dude singing "Good Riddance (Time of Your Life)" at every single graduation party. This could be a very, very bad thing.