It seems to be gone now, but did anyone else catch the the link to sign up for an account at the bottom of the main google search page today? Either they're just about ready to finally launch for real or, since it's gone now, they were just trying to get more testers since they've probably exhausted invites as a way of doing this.
I'm using the Graphical client. I downloaded the client again and installed it after the reimage, then copied the folder back, but didn't overwrite anything. It seems to be sweet, the WU picked up where it left off.