Threadbare

Okee, right link this time.

This one's my personal favorite http://wellstyled.com/tools/colorscheme2/index-en.html

Edit: Some more.

http://www.defencemechanism.com/color/
http://www.siteprocentral.com/cgi-bin/feed/feed.cgi
http://colormixers.com/mixers/cmr/
http://www.colormatch.dk/
http://www.visibone.com/colorlab/big.html