Many people have asked about training options for Acrobat 3D and now there is a great resource available for self-paced instruction from AdobePress.
You can find the book here
Here is an exceprt from the AdobePress site describing the book:
Realizing that the users Acrobat 3D is designed for–creative and engineering design pros who work with complex electronic documents–aren’t going to interrupt their production cycles to take a class, Adobe has brought the classroom to them. Through a series of self-paced lessons (each of which builds on the last and includes hands-on projects that the reader can create using the files on the accompanying DVD), this guide acquaints users with all of Acrobat 3D’s regular features for creating, reviewing, editing, commenting on, restructuring, and preflighting PDF files. It also includes thorough coverage of Acrobat 3D’s new industrial-strength features, such as creating Adobe PDF documents with 3D designs from major CAD applications; inserting 3D CAD designs into Microsoft Word, Excel and PowerPoint and converting to Adobe PDF; creating rich, interactive documents with 3D content and more. Professional tips and techniques are scattered throughout.