I have found a great compilation of 25 sites given free icon sets, which are very useful for web designers, I think this is going to be of interest of Linux users, as most of them are web designers.

The list includes, icons for web 2.0, gray scale icons, asp.net, face icons, files, databases, website icons, and lots more!

take a look at this page.

Free icons</img>

Check the full list here