I put together a service that takes a URL and spits back the dominant hexadecimal values used. It doesn't work on all pages, but give it a try to see what I mean.
I've found it to be useful for when I see a site that has a color palette I like and I don't want to have to take a screencap and use the eyedropper to get the color codes.
Try putting in news.ycombinator.com
or
myspace.com, etc.
Have some fun with the ColorJack sphere!