A new search engine named 3dfilter is currently in Beta, and allows users to scour the net for 3D models and textures.  The selection is fairly extensive, pulling in models from Google’s 3D model warehouse, 3dVia, Fallingpixel, and more.  I had expected a pretty sparse selection or dozens of paid-models, but I was surprised.  A quick search for “aeron” (the Herman Miller Aeron Chair was my goal) quickly turned up about a dozen models, including 3 free ones, and then hundreds of airplanes.

Results can be sorted by format, price, and relevance and then easily downloaded.  Check it out, and see if you find anything interesting.

UPDATE: 5/2015: Apparently this search engine has not survived, and there is no longer an active URL under that name.