Alphadesk
A good looking resources site with html tutorials, javascripts, flash animations, graphics and more. Not completely ended, but already promising

Go Graph
A site full up of any kinds of graphs : animated gifs, icons, cliparts, wallpapers, photos, interfaces, graphic sets and even Photoshop and Paint Shop Pro tutorials. A must!

Scream Design
Interfaces, buttons, tutorials : Photoshop, Dreamweaver, Flash and more.

Coolgraphics.com
Lots of of good things for your site : buttons, animated gifs, backgrounds...