A good set of resources. Thanks.

Here's a few more that I've found useful:

http://iconfinder.com (or the similar http://findicons.com)

http://365psd.com (free photoshop file everyday)

http://www.colourlovers.com/ (great for picking a color scheme)

http://graphicriver.net (really cheap graphics)

http://themeforest.net (themes)