The Graphic Design Olympics: Yep, love the angled grid on the ‘72 Munich icons and I’ve always liked the ‘68 version (dig the wresting pictogram!). And if you want to judge ‘em for yourself, the excellent Dover Handbook of Pictorial Symbols is well worth the 11 bucks.
300 images from 1800 sites is a collection of standard web graphics (arrows, printers, shopping carts) from well-known sites. There’s more of the same on iawiki. Remember kids: stealing ideas = good, stealing end products = bad.
GUIdebook is “a website dedicated to preserving and showcasing as many Graphical User Interfaces as possible.”