Recently featured on Time's 50 Best Web Sites of 2008, including one of the top user communities, is highly active designer resource COLOURlovers. Whether it be for ad campaigns, product design, architectural specifications - it's a great place to compare color palettes (and patterns), submit news and comments, and read color related articles and interviews.
"COLOURlovers is a color and design community for creative inspiration and sharing the love of color. Here you will find over one million color names, hundreds of thousands of color palettes and patterns, comments and ratings. Interviews with top creative professionals regarding color and articles covering current color trends and news are uploaded daily."