Acrobat 3D works with CAD drawings

Adobe® Acrobat® 3D Version 8 software empowers CAD, CAM, and CAE application users to rapidly convert virtually any CAD file into highly compressed, more secure, ubiquitous PDF files that can be used by customers, suppliers, and co-workers to quickly and easily review and mark up 3D designs with free Adobe Reader® software. The same PDF can also be leveraged by manufacturers for downstream CAD, CAM or CAE based processes without having to buy expensive CAD translators.

Link:
http://labs.adobe.com/technologies/acrobat3d_version8/