I found a post on CSS Juice that I found very helful called 25 Popular Color Scheme and Palette Generators. Its a very comprehensive post about Color Schemes and Palletes and very well organized:
I categorize these useful tools by scheme, palette and miscellaneous. Choosing a suitable color at a suitable place is extremely important when you design web sites. For example, CSS Juice mainly use white and gray for body and black for header and footer. This is because the site is also prepared for website showcase so the light background can flare the galleries.
Make sure you check it out!