As a follow up to my previous post, I should point you towards the redesigned Acrobat 3D section of the new Adobe website.... The entire Adobe website has undergone a significant overhaul including the Acrobat 3D section. In addition to rearranging the navigation tools and existing content to make it easier to find the information and resources from the old site, there's a lot more content available.
Here are some useful direct links
Acrobat 3D Product Page
Acrobat 3D 'Evaluation Center'
The first area to check out is the new Acrobat 3D 'Evaluation Center' where you will find demos, presentations, archived online seminars and an Interactive Simulator' (A3D-IS).
Acrobat 3D Online Discussion Forum
There are lots of different online forums and user groups that enable you to talk with other people interested in Acrobat 3D. There is an Adobe Forum for Acrobat 3D as well as an Acrobat Online User Group that has multiple forums including one devoted to 3D.
Sample 3D PDFs
I'm often asked if there are sample PDFs with 3D content available for download. You will find over 20 PDF files here that with examples of 3D content from the automotive, aerospace, machinery, eletronics, architecture, engineering and construction industries and some that have examples of technical publications with 3D interactive content.
Free 30 Day Trial
If you would like to try Acrobat 3D, you can download a 30 day free trial here.