I use some interactive PDF files (not sure what else to call them) but have not been able to get them to function on my Zoom or Droid Incredible. Basically, they're before and after that contain a floating model in the middle that I can rotate in the center on all 3-axis. It's hard to describe.
Anyway, if anyone would be willing to try loading it on their PDF viewer for functionality, please PM me and I'll email you an example to try. As yet, I can load it, but can not select the "after" arrow and cannot manipulate the model (rotation and such). You'd probably have to load it on a computer to compare functionality. It works just fine on any PC I've tried.
HTC Droid Incredible - CM7
B&N NookColor - Dualboot CM7/HC
Motorola Zoom WiFi - Tiamat v1.4.2