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Earlier this week, Gwyneth Paltrow's new start-up Goop.com went live. The site promises to have tips for food, shopping, and life in general from the actress.

There's no telling whether it's going to be more of a blog or an actual business venture with branded products, an editorial staff, and a synergistic TV program. What we do know is that Paltrow is simply the latest in a long string of celebrities who have come off the big screen (or out of the recording studio) and onto the Web with products and services backed with their money and persona.

Below are 14 recent ones, including updates on whether they're still around.

Celebrity: 50Cent Site: ThisIs50.com ThisIs50.com is a cross between an online resume and a place for fans to gather. What makes it an interesting business venture is that it's been created using the build-your-own social network service Ning. 50Cent, whose real name is Curtis Jackson has leveraged all sorts of brand integration like a Kyte.tv video player and links to various places to buy and stream his music, including imeem.

Status: Alive and kicking, although it's a visual mess. There's also a 50cent.com, which is far cleaner and powered by MTV-owned Flux.

Celebrity: Ashton Kutcher Site: Blahgirls.com Kutcher, who is also the founder of VoIP start-up Ooma, launched Blahgirls earlier this month at the TechCrunch50 conference in San Francisco. While mainly playing an animated video series, it's also a celebrity gossip blog that plans to make money through advertising and branding that shows up inside the videos.

Status: It's too early to tell but celebrity blogs can rise to prominence and then fall down with startling volatility. Much of Blahgirls' longevity will come down to the content, which in the case of the SouthPark-esqe animated show makes it fairly watchable, even to newcomers.

Celebrity: Andrew Shue Site: Cafemom.com Shue, better known as "Billy Campbell" from the 1990s TV series Melrose Place is also the co-founder of Cafemom.com, a social networking site for moms. The site launched in 2006 and offers a place for mothers to share tips and stories and to come together with other nearby moms.

Status: Cafemom is doing very well. It picked up a $5 million round of funding less than a year after launching. According to the site, it's getting more than 6 million unique visitors a month.

Celebrities: Baron Davis and Cash Warren Site: IBeatYou.com Davis, the pro basketball player, and Warren, a Hollywood producer, are co-founders of IBeatYou, which is a competition site. Users can create challenges and have others compete in order to earn points. Much like Worth1000, it's become a repository for quirky user creations like photo contests and one-upmanship.

Status: Alive, although it's too early to tell where it will end up. The site launched in late March and has since picked up just under $1 million in seed funding.

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One of the remedies I often recommend for a sluggish system is to defrag the hard drive. For those unfamiliar with the term, defragging involves reorganizing your hard disk by placing files closer together so your operating system can find them more quickly. Your Windows operating system comes with a disk defrag utility of its own, but anyone who has ever used it knows it takes an unbearably long time to do the job. Fortunately there are excellent free defrag utilities you can download to make your system run better immediately.

One of my most recommended free defrag apps is … Read more

I bet you think this podcast is about you. Don't you? Don't you!? On today's show, we learn how easy it is to spot a narcissist on Facebook (stay away!), terrible ideas that will criminalize professional eBay sellers and kill eBay even faster than it's killing itself, and how video games might be the only thing that can survive a recession.

Listen now: Download today's podcast

Bill would give retailers power to halt online auctions http://arstechnica.com/news.ars/post/20080924-bill-would-give-retailers-power-to-halt-online-auctions.html

Users fail to spot fake pop-ups http://news.bbc.co.uk/2/hi/technology/7633402.stm … Read more

NEW YORK--The crowds at the Web 2.0 Expo seem to have one clear consensus on what they think of this week's Wall Street meltdown: things are bad, but it's no time to panic.

Of course, they're all pretty relieved that the tech industry can't be blamed for this economic meltdown.

"This is a very good time to start up a company," investor David Rose of the New York Angels firm said in a panel called Starting Up in Silicon Alley. "Despite the calamities that are going on outside, the world is not coming to an end."

The current financial crisis is less than a week old, after all, so the outcome is less than certain. Most of the conference crowd chose to be cautiously optimistic.

The Jacob Javits Convention Center is only a few blocks from Wall Street. Yet at the Web 2.0 Expo, it was mostly business as usual: marketing, monetization, branding, social advertising, and a Microsoft-sponsored party on Wednesday night where the centerpiece was an ice sculpture that dispensed vodka shots.

Standing at his company's booth on Thursday afternoon, one representative of a Web-based nonprofit organization shook his head with disapproval. "Not enough people are talking about it," he said. We all know what "it" is.

In fairness, it's a stretch to say everyone was twittering while Wall Street burned. The underlying attitude at the Web 2.0 Expo was one of sober acceptance, realizing that conducting business in 2008 is more difficult than it was in 2006.

I'm very worried," said Majid Abai, CEO of the community software start-up Pringo. "When the economy is down, investment in technology is down."

There's reason to be concerned: financial-services companies are often cutting-edge technology buyers, and the mess on Wall Street makes it unlikely that big brokerage houses (at least the ones still standing) will be spending on anything nonessential anytime soon.… Read more

UPDATED: Trial not limited to 30 days, clarified YouTube video embedding.

I'm not a big fan of iTunes for Windows. Even though I have an iPod, I haven't used its software sibling in nine months. (That'd be enough time for Apple to gestate a better version, you'd think.) However, iTunes addicts who just can't break away might want to take a look at TuneUp Companion, a neat little plug-in recently out of beta. It does a much better job of album art downloading, track tag repair and discovery, and tracking down concerts by your favorite … Read more

What was the unlikely culprit behind a 75 percent drop in United Airlines' stock on Monday? An erroneous Google News search, that's what.

The problem was that an investor news service, the South Florida-based Income Securities Advisors, found a Chicago Tribune article from 2002 via Google News and consequently included it in that day's news digest--which wound up on Bloomberg's news wire. The content of the story wasn't the sort you want to be publishing if it isn't true: that United Airlines had filed for bankruptcy. Considering the state of the airline industry today, it … Read more

I am sure there will be those who are excited to the point of valiumity at the vast array of startups vying for the attention of frightfully important people at TechCrunch50.

However, being the champion of the disgruntled, I would like to tell you about the five companies who should have been there, but were rejected due to reasons that might be best described as extremely bloody suspect.

1. Phishingphleet.com. Such a nifty idea, this. You register with Phishingphleet.com and they create truly realistic emails to persuade people you know to give you money. For example, the company … Read more

Most of the time our Macs run smoothly due to the well-designed Mac OS X (choose your big cat) operating system. But over time, as you download more applications, visit more Web sites, and begin to use up space on your hard drive, your Mac won't run as quickly and smoothly as it did out of the box. Some users reason that it must be a RAM or hard-drive issue, but more often than not it's a question of maintenance rather than inadequate hardware.

I've talked about programs for uninstalling old or unused apps in an earlier post, … Read more

The California Supreme Court on Thursday upheld a long-standing state law ruling that employers can't restrict employees from working for a competitor or soliciting former clients when they leave the company.

That may be good news for California-based tech employees who want to take their skills to another company, or head a start-up that may directly compete with their former employer. "Noncompete" contracts, in place largely to protect an employer's intellectual property, began being used by companies during the dot-com boom to prevent losing valuable workers in a competitive technology labor market.

Microsoft and Google battled … Read more