3
Pinvoke.com has two quite nice icon sets. Famfamfam as well.
All licensed unter CC-By.
1
Commenting because my low rep won't allow me to post more than one link at a time:
Silk: http://www.famfamfam.com/lab/icons/silk/
and Tango ain't half bad: http://tango.freedesktop.org/Tango_Desktop_Project
Inserted the links for you – Nifle – 2010-06-17T21:22:19.143
3
I've used Iconfinder a few times. It indexes lots of icon sets by keywords, you can limit the search by the size of the icon, and it displays the license for each icon/set (and you can filter out those that aren't allowed for commercial use, if necessary).
+8524. Iconfinder is amazing. I'm glad they redesigned the home page. – zildjohn01 – 2010-06-17T21:32:29.527
1
The Tango Project has of course a nice variety of different icons.
1
Here are some resources I use often:
0
http://art.gnome.org/ sorta hard to navigate but there's quite a collection there. GPL licensed.
2Should be community wiki – Earlz – 2010-06-17T21:02:10.087
I really thought icons were used in computer software, maybe my mistake since the question got closed. – RHaguiuda – 2010-06-18T12:42:29.493
If I had the rep I've vote to reopen this – Earlz – 2010-06-22T23:40:29.373