Free GPL Icons
I completed a sweet set of icons for use in any web or development project. The icons are licensed under the GNU General Public Lisence, and have been released on the Lullabot website.
You can download the complete set from Lullabot, complete with 'source' Photoshop files. If you're interested in contributing, or just developing some Photoshop skills, check out my article on creating small vector-based icons.
The image above is just a preview, the acual icons are included below: