Livelygrey

Livelygrey is the blog of dutch color expert Igor Asselbergs.  It contains lots to interest web designers and other people who use colors in their day-to-day life. This is from his post on Color Contrasts:

Repeat after me: It's not about the colors, it's about how the colors relate to one another. Say it loud. Say it one thousand times. And never forget it.
Don't worry about what I mean by that. Just read this blog. Ultimately, each and every post on this blog is written to support this premise.