The Hypemachine, Groveshark and SoundCloud understand that the future will be streamed.
You can listen to (in their entirety) every album of the Hypem top 50 of 2009. The top 50 was crowd-sourced from the top 10 lists of over 500 bloggers. The albums are hosted by Groveshark.
Yes, the Hypem leaderboard gets gamed now and then, and it sometimes get clogged with meme-ooze, but the web’s messy like that.
SoundCloud is a mix-hunters paradise. I’m listening to Dj Czech’s “Bucket Of Grease” mix right now.