i was doing a quick search for icons today. here are some really cool links.
http://divageekdesigns.com/2008/06/02/more-icons/
http://www.iconfinder.net/
http://www.fineicons.com/en/favicon-gallery
http://webtreats.mysitemyway.com/
http://webtreats.mysitemyway.com/category/icons/
http://www.komodomedia.com/download/
http://www.webappers.com/2009/06/26/80-refined-social-networking-icons-for-free/
http://www.freeiconsdownload.com/Free_Downloads.asp?id=562
http://www.productivedreams.com/page-peel-free-social-iconset/
http://www.jankoatwarpspeed.com/post/2009/02/23/Handycons-2-another-free-hand-drawn-icon-set.aspx
http://webtoolkit4.me/2009/03/17/polaroid-icon-set/
http://icontexto.blogspot.com/2009/04/icontexto-web-20-user.html
http://www.blogperfume.com/social-media-icons-pack-in-3-sizes-for-download/
http://www.blogreign.com/2009/06/16-sets-amazing-social-networking-icons-free-download/
http://www.chazzuka.com/blog/?p=186
http://www.aoddesign.com/blog/resources/social-networking-icons/
http://fasticon.com/freeware/index.php/web-2-icons/
http://speckyboy.com/2009/01/26/30-amazingly-creative-social-bookmarks-icon-sets/
http://www.smashingmagazine.com/2008/10/27/heart-a-free-social-icon-set/
http://webtoolkit4.me/2008/09/05/webtoolkit4me-releases-the-first-icon-set/
http://paulrobertlloyd.com/2009/06/social_media_icons
http://www.chris-wallace.com/2009/05/28/free-social-media-icons-socialize/
http://www.instantshift.com/2008/12/10/20-free-social-media-icon-sets-for-bloggers/
http://webdesignledger.com/freebies/the-best-social-media-icons-all-in-one-place
http://directoryfordesigners.com/50-free-social-media-icon-sets-for-your-blog