Oftentimes, designers and web developers look to many places for color inspiration, complimentary colors and attractive color schemes to use in their design.
I've used several of these online tools to assist when selecting colors for website design and branding items. It takes a bit of time and guesswork out of the process and can also give you some new ideas for putting colors together.
From the creative minds at Adobe, there are 17,000 preset themes and also ways to easily create your own. They can then be downloaded and used in your Adobe Creative Suite 2-6.
Pictaculous
ColoRotate
Color Explorer
ColorSpire