Visible Body: Argosy Publishing

Let's get to the limitations right away: Mac and even Firefox users will have to sit this one out, since it only runs on a PC, in Internet Explorer. And XP is probably your best bet, too, since Vista users have apparently reported some glitches when using the beta version of this very cool new interactive tool.

All that aside, though, the Visible Body, a new, and free, interactive experience from Argosy Publishing, is pretty mind-blowing. It's Gray's Anatomy in 3-D. (The book, people, not the show.)

At this point the app doesn't impart too much information; it helps the casual browser learn what's where, but not how things work. Navigating the 3-D model is fairly intuitive, and the program keeps things simple by starting with a basic skeleton, and letting the user add different systems or organs one at a time. Med students or undergrads cramming for exams are probably going to love it, but it's a neat experience for a run-of-the-mill nerd, too.