rhino3dmodels.com - Free 1100+ Rhino models to download. Once you register you can download from Free directory. To download from the other directories. You must upload a Rhino model to download.
Hardware01.zip - A .zip file containing many Rhino models of various fasteners.
Gemstones - Models of standard gemstones in mesh form, easily convertable to surfaces.
McMaster-Carr catalogMcMaster-Carr actually has models of a lot of their fasteners, they aren't all perfect, and some take a little rebuilding, but it's a lot better than pulling out the Machinery's Handbook and starting from scratch. Find the part you want, then once you get to the part page (with the little drawing of the part) up top there is a download button, select IGES and it opens right up in Rhino! --Sam Page
Tyco Electronics catalogSimilar to McMaster-Carr: Find the part you want, then once you get to the part page, under the "Corporate P/N", there will be a "CAD Geometry" link if they have the part in 3D, if that's the case, select IGES to download a zipped IGES file. - FREE always
Ultra 3D A range of high quality modern furniture models and accessories - FREE once you register.
3D Gurukul Free 3D models in Max,Maya, Poser, C4D, and others, as well as a gallery, artwork, textures, tutorials.
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RC Groups Forums Lots of 3 views of all sorts of different airplanes. I know they're not models but I thought it could be an interesting resource for someone using Rhino,