I mean't to post this a while ago, sorry for tardiness. Hit this link to check out the list of winners in the recent Acrobat 3D PDF contest
You can then download and explore some of the winning entries in the 3D gallery here....
I particularly like the “Heart Structure, Function and Arrhythmias” [PDF: 6.6 MB] publication, it took first place in the Technical Publishing category.
It allows users to interact with objects through various means, including rotation and frame sequencing to show three-dimensional movies.
Also check the 3D human body model... ewwww! Well done Christian Lietzau :-)