I can"t recall how I came accross this
link but it is really handy. It basically describes how colors should be combined so that they are pleasing to the eye. I never actually knew that this type of stuff existed. I am going to do a bit of reading about this because I found it quite interesting.
My limit of understanding about colour theory (Color Theory for anyone outside the UK) is to use shades of the same colour. So, SteelBlue will contrast well with LightSteelBlue.
I will have a bit of a Google for more information. I have a feeling that this will all be on Wikipedia too.
I have added it too my Favorites, I don"t know why though. (My Favorites in IE7 crash everytime I try to view them)