Maybe these sites is what you need.
- http://glyphicons.com/
400 nice black and white glyphs - http://www.famfamfam.com/
Home of the silk icon set (1000 icons) - http://www.smashingmagazine.com/2008/03/06/35-really-incredible-free-icon-sets/
A lot of links to other good icon sets - http://www.iconarchive.com/
