This is adapted from an FR hostile source. RepRap wikipages Mostly RepRap oriented. Start at the the Buyer's Guide for a list of vendors. Pirate Bay’s Physibles Facebook page For the naughty bits (like eeeeeeeeevil guns) banned on other sites. Their Facebook page is the PG rated version. Defcad Cody Wilson's site, mostly MakerBot oriented, good search interface 75K+ downloadable designs. Shapeways Make+Sell section to build your designs (various materials). Good tutorials, including material design rules, print compatibility, finishing techniques. Fabbaloo Reviews of materials, printer and designs, links to croudsourcing, hobby printers, print services and articles on 3-D printing, Thingiverse...