Pretty cool site if you are stumped on some color combos. I think they are all web-related, but I use them in print design also.

COLOURlovers™ is a resource that monitors and influences color trends. COLOURlovers gives the people who use color - whether for ad campaigns, product design, or in architectural specification - a place to check out a world of color, compare color palettes, submit news and comments, and read color related articles and interviews.

CSSTux, one of many CSS gallery websites I keep on hand in case I am running out of ideas or need some inspiration.