I have to kick off color week with Adobe Kuler! It is amazing, if you have never used it, or another program like it, you are in for a treat.
If you are anything like me, I get stuck on color, for some reason I gravitate back to the same color schemes over and over. It is not like I mean to either, I think it is just that I know what I like and not meaning to I go back to the same schemes to often (for me it is Brown, Turquoise, and Pink...). I don't think that all of my clients like want the same colors, so when I get stuck, Adobe Kuler is the best! It really helps me explore lots of color options with out overdoing the default swatches in Illustrator and Photoshop.
Adobe Kuler is free and super easy, sign up for an account and just play around with it. I chose one color as my base color (#FF6B7D, the color shown in the center of each scheme), and look at all the fun color schemes that I was able to come up with. Below each color scheme is the description of the color scheme(the definitions are from Wikipedia).
The high contrast between the colors creates a vibrant look, especially when used at full saturation. Complementary colors can be tricky to use in large doses.
Isn't that fun?!?! My favorite scheme with this color ended up being Complementary.