It's in beta.  Get it while its hot.  I shyed away from doing too much testing with the alpha releases, but think it might be time to setup a vpc on my thinkpad to play with the beta.  Grab it off msdn.

UPDATE : Don't get it off MSDN.  Get it here.

UPDATE 2 : Well, that site says get it from msdn.  Msdn only shows the march and may previews.  False start?

UPDATE 3 : In a couple days the whole thing is out.  For now, just the express packages.