Flickr: if you haven’t looked at flickr, and you have any interest in viewing and sharing photos on the internet you must check it out!
Stewart Butterfield, founder of Flickr, gave a fascinating talk at eTech demonstrating a number of very cool uses of flickr. I’ve played around with it a bit before, but after this I can tell I’ll be spending much more time using this excellent site/tool.
Here’s the fantastic flickr color wheel. Select the color you want, and you will be presented with flickr images of the same color.