After years of building up their buzz in Europe while leaving us waiting in America, Spotify has finally come to the States. For those of you who don't spend 40+ hours a week basically tethered to your computer like a drone, Spotify is a music streaming service much like Pandora except that instead of building a radio station you can listen to whole albums. So essentially its a place where you can go when you say "Oh man, you've never heard the second track off of Gerbil Terminal's third EP? Let me just type that in...here we go." (Ed. note: Gerbil Terminal is not, to the best of our knowledge, a real band.) Other similar services that were already growing in popularity in the US were Grooveshark and Rdio.
I'm willing to shell out some $ a month for a new service (I've already found Rdio to be completely worth the $10 a month I pay for it), but it is definitely going to be one or the other for me. And it will all come down to who has the larger selection.
For artists looking for distribution you can go here to see who they are working with.