This one might just be a hit with the geo-caching crowd. It's the GPS-CS1 from Sony, and it tracks your locations using satellite systems and relays them to your PC. When you get back to your computer, you can see where you've been (and when). The result, especially when used in conjunction with a digital camera, is a full-on geography report.

We can imagine you or someone you know including the GPS timestamps in a slideshow or video presentation to give it even more of a "You Are There" feel.

You'll have to use Sony's Picture Motion Browser to interpret the timestamps, and you'll have to use a little ingenuity to combine that GPS data with digital images. But it can be done.

You can pick up one of these GPS trackers at Sony retail stores or elsewhere, where it will set you back US$150.