Karla, of KarlaSugar, is amazing. She swatches entire lines and collections and shares the pretty pictures with the intertubes. She's got great arms for swatching, too––no bright blue veins like yours truly. She does (almost?) entirely high-end products, so she's a great resource if you're placing an online order and want to give yourself as good a chance as possible at dropping a chunk of change on a color you actually like. She's also funny and a very good writer, and her color descriptions are spot-on. You should really be browsing her site instead of reading this paragraph. Go! Now! Sheesh.
