Have you worked with Kuler yet? Before you read too much further, go try it out (link to Kuler).
You can also access it directly inside Adobe Illustrator CS4 as a way to get inspired about or just share color (see how). We here at the Adobe Education Technologies blog use it on occasion when we are looking for our own inspiration, and we were pleasantly surprised at the latest update to Kuler called Community Pulse.

The screenshot shows Community Pulse in action, namely the popularity of colors downloaded in the USA (l) and Brazil (r) in Spring 2008. Larger circles and bars indicate more popular colors (i.e., themes with those colors were downloaded more often).
