There are some pretty interesting things on the Autodesk Labs site that are worth checking out. One thing you may find pretty interesting is Freewheel , which allows you to look at 2D and 3D designs interactively over the web without downloading a viewer or even a plug-in. Some of the things you can do are
1. Display interactive 2D and 3D CAD designs without downloading a viewer.
2. Embed this viewing capability in your own web site.
3. Mash Up Freewheel with Google Maps - You can embed Freewheel within a KML file to display CAD data within on-line maps.