emusan: also should be noted that with Amazon, anything purchased from their Music store is not considered in your cloud space calculations(so you could own everything there and still have the free 5gb left), and they are also giving away 20gigs free for a year to anyone who buys an album(not sure if its all albums or just a few), which is quite nice.
imho google is too little too late this time, I don't need an "invite" to get onto the Amazon music cloud player, and I've already uploaded all my music to that, so no real point in switching to google at this point... of course they will probably come up with some irresistible feature before the end...
You need an invite because it is still in beta. Jeez.