After browsing the blogosphere today I stumbled upon a very nice color scheme web application created by Adobe: Kuler. It reminds me of a bloated, but better version of Colorschemer.
Easy to use
It's very easy to use and the Kuler concept offers a great deal of community interaction.
Side note
Remember, if you want to pick colours from your desktop, or from everywhere else on your computer, you can use Colorpix from Colorschemer.
Update: Is Kuler a rip off?
Hm, I just discovered that Kuler is a rip off of colourlovers.com: http://www.colourlovers.com/web/blog/2007/07/06/for-the-record-adobe-kuler-vs-colourlovers / http://visualrinse.com/2007/07/07/adobe-ripped-off-a-blogger-to-create-kuler/