Kuler: Colour Palette Generator from Adobe

kuler is brand new from Adobe Labs. kuler helps you explore, create and share color themes for your web pages, design projects and other creative work.

You can use kuler as an on-line application or you can download themes to use with Adobe Creative Suite 2 applications.

Try it out here: http://kuler.adobe.com/

Note: you must have the latest version of Flash installed to use the program.