[sixothree]

I don't see where you can sign up at all.

[ben1040]

http://play.google.com/music/listen

This gave me an option to sign up. I can play music through the web, but there's no update to the phone app yet.

[Zikes]

They noted that the launch is today, but it may not be live yet. Probably in the next few hours, now that it's been announced.