nice, I forgot that I had an account with them, created a lot time ago (11/08). I'll go check them out.
My Miles Davis station is great for that. The station "Groove Salad" on soma.fm is also a good one--depending on your tastes, they may have some other channels that work better for you.
I always lime to listen to my Mogwai station. It's nice because it's all instrumentals with no words.
QuickMix of Ratatat and Sound Dimension - All instrumental.