Sketchfab is a lot of fun. Its a hosting service for sharing & embedding 3d models on the web. Using webGL through a suitable browser, you can post 3d models online & share them with others. Sketchfab describe themselves as wanting to be the Youtube for 3D content. Its worth a look & good fun. It supports up to 27 native formats & I hear a rumour a Revit exporter might be on the way.
Check it out http://sketchfab.com/
This was little bit of experimentation: Vasari shuttle, exported to DWF & then uploaded to sketchfab