Here's my beef. I'm still seeing stuff coming out for use with AMStracker. Why on Earth would anyone want to use it when there's an open alternative? It boggles my mind. So, if anyone is interested in playing around with Apple's motion sensor. Don't use AMStracker, use Motion. It's open and what's even more important is, it works. AMStracker works on one model of three. You can hardly call that functional. Also, if you know of anyone who is likely to do anything with Apple's motion sensor, share this info with them.
Motion can be downloaded (source-code, Makefile and compiled binary) here:
Support for the newest PowerBooks isn't in the compiled binary yet but the source-code contains comments showing how to implement it.