- Some of the best icon designers are publishing their free sets on Smashing Magazine: http://www.smashingmagazine.com/tag/icons http://www.smashingmagazine.com

- Some of the best icon designers are publishing their free sets on Smashing Magazine: http://www.smashingmagazine.com/tag/icons http://www.smashingmagazine.com/tag/icons By following the links under each posts you will stumble upon additional commercial sets. - There is ThemeForest's sister website called GraphicRiver.net which focuses on stock graphics. - Also don't forget about istockphoto.com and fotolia.com, besides stock photography they are also offering many icon sets.