Google has announced a music streaming service via Cloud.  Sign up for beta  Currently the only way to gain access to this beta is to be invited.  You can click on the link I provided and ask google to please send you an invite.   More info after the break!
So what is this cloud?  What it does it let you upload all your music to a google server, that means you don't have to keep all the music on your computer.  Now, its always safe to have a back up, but do you really think google servers will go down? I don't.  (Lets hope they don't get F'd in the A like sony).  The limit cap is 20,000 songs.  I don't' know about you, but I have about 1/20 of that amount :).  I have requested beta access and when I receive an invite and can invite people myself, I will give those invites out on this blog.  So keep looking for it.