Adobe has released an API for Kuler, their color-theme community that is tied into Photoshop and Illustrator.
A while back, I did some packet-sniffing between Adobe’s Flash client (on the kuler site) and the servers, did some documenting of what I found, and then developed a quick-and-dirty app that used the rough API I’d worked up. (Note: that app no longer works, though you can get the same data through the new RSS-based API).
Nice to see Adobe opening kuler up to more of this kind of thing.