Pimptastic icons can really make a highly customized desktop environment feel, well, cozy. If you're the sort of person who gets all squiggly inside over rendered 3d icon love, Iconfinder is a definite must see.

Just back online after an unspecified absence, Iconfinder lets you search for all sorts of icons just like you'd search for any other web content. You won't find everything you're looking for, but hopefully as they work to relaunch the site we'll see more icons for common tools we all know and love.