AutoCad Blocks on the web
http://www.srikumar.com/cad/free_autocad_blocks.htm
http://cben.net/
http://www.cadmonkey.com/blocks.htm
http://www.autocadblock.com/
http://www.ceco.net/autocad-free-symbols/freesymbols.html#jan04
http://www.freecadapps.com/shareware.php
http://www.we-r-here.com/cad/index.htm
http://www.caddigest.com/subjects/autocad/tutorials/blocks.htm
http://www.click4links.com/
http://www.autocadhatchpatterns.com/links.htm