http://music.google.com/I have been using Google music for a month now. For those who are unaware, it is pretty much free cloud storage for music that you can play back via internet browser. Overall, it has been pretty nice that I can listen to my entire music library at work. No library size limit, but a limit of 20,000 songs.
It is also nice that it is worry free music storage, I fragged my whole mp3 collection twice now, which is not a huge deal since I have most my music on CD, but it is a pain ripping the CD's to mp3.
To get my major complaints out - The player is lacking in options, the upload tool is slow, and album art randomly disappears in the transition. There is also no options yet to play on devices other than android devices. I would love to have my collection on my PS3 or Wii without taking up HDD space. However, it is still in beta stage right now.
Right now, getting Google music is by a "request access and wait" system or by invite from a current member.
I have only a couple invites to give out, so let me know if you would like access.