A friend in Canada just pointed out that he's been waiting for Spotify to be available there for a long time and now that it is, he hasn't used it once. I've had the same experience, though probably due to nothing more than laziness. I have it downloaded, but haven't opened it in years. I've always just stuck with Pandora.
Which service do you prefer? Why?
I've listed all that I can think of, but if there is another you use, please list it.