I'm a bit of a color nut, and I was just blown away by Kuler. It's an online, community driven color palette creationg and sharing app. I know, that's a lot of verbage. It's really cool though and could be really inspiring if you're looking for colors.
It also feature some pretty sweet design of its own. My favorite part is the ginormous color swatches. That being said, it can take a while to figure out how to create palettes of your own. It's worth it though. Once you get the hang of it, it's great because of their support for some of the classic color theory constructs (triad, complementary, etc.). Great job Adobe!
They also included a pointer to this great color theory overview. This is a really good read, especially if color is not intuitive to you--you know who you are.