Where do you get your icons?

http://www.iconfinder.com is a good place to start.

I like to draw them myself using inkscape, but when I feel lazy I generally use findicons.com to find nice-looking and appropriately licensed icons.

I still believe famfamfam (http://www.famfamfam.com) is pretty good.

Fatcow: http://www.fatcow.com/free-icons

Wow, famfamfam and fatcow are really nice sets!