UI Tools

I've been doing some UI work recently and stumbled across these free tools online:

http://www.pixlr.com/editor/
If you are looking for an alternative to Photoshop, this is a great flash app you can use and save your work locally. I've found it to be a great place to create gradients. Easy to use and there are Rest services other apps can use to edit images. The best thing, everything is free!

http://colorschemedesigner.com/
If you are not a color wheel expert like myself, start here! A cool tool to help you come up with a color scheme for your website. The tool will give you corresponding colors to complement your color choices as well as a host of color contrast options. The most useful tool for me is the ability to demo you color choices immediately with the "example" pages.

Enjoy!