I love listening to music... all day, every day. Helps with my sharpening, makes me feel good, and is just plain old fun. I've been using pandora since college, along with an extensive personal music collection. Lately, there have been other services popping up. I've tried rdio, grooveshark, last.fm, and spotify. Spotify is my most recent test, and i'm pretty happy so far with their premium service- high quality streaming, vast selection of music, works on my mobile devices.
Just curious who else uses streaming audio services... what do you use and why?