Check out muxtape.com before it gets taken down. You can listen online to others' "mixes" of songs. FREE. FREE. FREE. FREE. There's no mess of worrying about downloading files. You just click and listen.
senorwizard's page is purely ai-ightly tight.. It's the first link that I clicked on and the only mix that I've listened to so far. Now how do I find a way to download these tasty songs?
Don't worry about the inevitable takedown of muxtape, it's just a watered down clone of the playlist feature that imeem.com has been doing for the last couple of years.
Seriously, muxtape is only interesting if you've never heard of imeem.