I've been wanting a tablet PC for a while now, and this game (page currently lagging) only reinforces it. In case the page won't load, here's a review of it, and below is a demo.
I've seen tools like these accompanying textbooks before, but unfortunately never had one with a book that I chose. I should write to a few publishers to see if they have demos I can download. Unlike this "game" version, they're generally designed to accompany a Physics I course, so students can explore physical situations without friction, or so that students can perform online labs. (I'm curious about doing online labs and wish to explore the possibilities, but I will take a lot of convincing before I'm willing to do it.)