http://www.ganato.com/free_icons/free_icons.php

File format: PSD

License: Completely free

Ganato.com is a great site. The website says you can use these icons wherever you want, all free stuff on the website is completely free,  but the only exception is that you cannot make it available for download directly from your site or sell them as is (e.g. icon packages), you should link to the web page instead.