The CAD Block Exchange Network was a big time saver while I was in school. It is proclaimed to be " the largest, most comprehensive 100% community built .dwg CAD block library on the Web." The creators request you upload a block if you download one - but it's not required. You will find hundreds (maybe even thousands) of FREE 2D & 3D CAD BLOCKS here.CBEN's blocks come from the users, so you may find a block you already have as part of your standard block library, a 3d model of a Barcelona chair and occasionally a line drawing of a Pam Anderson (why??). When I first discovered this resource, the search tool was not working and you had to search page by page. But I checked before I posted and the search tool is up and running.
There are 2 main drawbacks: 1) Some drawings do not have a thumbnail, so you have to download and open the file to see what it looks like and 2) Remember this is a user contributed site and some users may unknowingly (or knowingly) upload a file with a virus - so scan before you download!!!
