In need of icons

I lately found the need of having some icon collection for my designs. Was just wondering if anyone can direct me to a free icon site or sort.

These icons are quite nice:

http://tango.freedesktop.org/Tango_Icon_Gallery
http://www.famfamfam.com/lab/icons/
http://www.bluevertigo.com.ar/bluevertigo.htm (If you scroll to the right, you'll see a list)

Thanks man,
Ur links are simply grt, especially for famfam.
once again, thanx