I'm familiar with Archibase, but I'm curious what other real world manufacturers have developed 3D models of their products for visualization in architectural programs and other 3D renders and animation. It's essentially free product placement. They pay TV and movie studios for that kind of advertising, so why not do the same for nothing.  A lot of companies have probably already paid for the creation of models for their own advertisements, so there isn't a huge cost to make them available to the 3D communities.

I think I have a couple more links that I need to dig up.

ShareAEC seems to be a subset of ShareCG, but I think I've found a few models that I didn't have.

Thanks on the Eiffel Tower.  I hadn't found that link.

My visual indexes of Poser content are at http://www.sharecg.com/pf/rgagnon