I think that these sites are really helpful when choosing a color scheme and they keep getting better and better here is an updated list of a few of them

ColorCombos
COLOURlovers
ColorJack

UPDATED: Here are 25 more for my webhost:

  1. 4096 Color Wheel
  2. ColorExplorer
  3. Color Combos
  4. [ws] Color Scheme Generator 2
  5. Color Wizard Ver. 3.0
  6. colordb
  7. Color Hunter
  8. ColorSpire
  9. Web 2.0 Colour Palette
  10. colorjack
  11. Accessibility Color Wheel
  12. ColorToy 2.0
  13. Sessions.edu
  14. Colorbe.com
  15. Color Palette Generator
  16. Kuler
  17. Cymbolism
  18. COLOURlovers
  19. 100 Random Colors
  20. Color Tools
  21. Pic2Color
  22. Color Blender
  23. colr.org
  24. Color Schemer
  25. GenoPal

Here are a list of my previous points on the same subject:

Color Mixers
Hex Code Color Generator
ColorLovers

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