Adobe is releasing a new product that will allow you to pass a three dimensional image that can be rotated and scaled in the pdf format. It is expected to be used heavily in the manufacturing market, however it seems to me that it could easily be expanded into the medical and many other fields with great results.
If you have Adobe Reader Version 7, you can view a demo to see what the buzz is about. Right click on an image and choose show toolbar. It is fairly intuitive after that. I have taken a small screenshot of the sample three dimensional turbine.
