If your color blind or have difficulties in selecting colors that are well coordinated, then head on over to Adobe Labs Kuler … this is where one does colors and does colors properly … you can search for a “color theme” or by a specific color … you will then be presented with a bounty of options from a simple “copy / paste” of a color value to full API application implementation …

The colors used on this site were taken from Kuler … I used the “Engineering Industry” theme …

Give it a try … your site, applications and eyes will appreciate the effort …