Explore, create and share color themes...for free

Kuler is a program from Adobe that's free and in its final release. It's a Web-based application, so there's nothing to download.
You can create "color themes", color palettes, etc, and save them online or download them as swatches to use in your Adobe applications. You can view the most popular color themes that others have created and download theirs, too. What's really cool is you can create a color palette from a photograph - easily.
Visit kuler.adobe.com