I feel Samurai.fm are worth a plug too. I came across them when the Web 2.0 moniker was a buzz word around 2006 latest. Initially I was blown away with the sheer volume and quality of content. They're a bit different from the other services as it's a curated music service so someone is choosing who does or doesn't make it.
They have pulled a clean interface together since their original layout, and somewhat unusually, have a keen bias towards Tokyo. This minimal set by DJ Camiya works for me.