We launched http://www.grabcad.com this Tuesday. It's a CAD library where all downloads are free (you don't even have to sign up for an account) but it's worth signing up if you're looking to expand your business. We encourage everyone to upload couple of files, fill out their profile as then we can get in touch with paid projects. Better files and reputation (as voted and commented by others) means better change in getting some freelance work.
Anyway, check out the models at http://www.grabcad.com, see what you think of the site and let me know. We're looking for features to add, things to improve to turn it into a nice place for CAD engineers.
Siim @ grabcad.com