Phone Halo keeps an eye on your gadgets

Phone Halo is a $60 gadget that turns your BlackBerry or Android phone into a handheld finder. Unlike some more traditional key finder hardware, however, Phone Halo integrates Bluetooth and GPS to create a tethered radius for your gadgets. So, if one of them goes out the door without the other, you get a message about it back on your phone, or through e-mail and even Twitter.

Read more about it here.