It has sometimes been hard for me to get ideas for color combinations to use in my designs. I tried using kuler, a mini-community for swatches by Adobe. It's just combinations of up to 5 colors that people post and rate. The idea is great, the interface is quite friendly, but it lacks the practicality that I was hoping for. It's pretty hard to imagine the appearance of my design with the colored rectangles that appear on the site.

Still, I would recommend it for people who would like to find some interesting color matches. If you're using Adobe software, it's even easier, because you can download the .ase file and use it directly.