So, I've run across a lot of playlists on this website thanks to StumbleUpon, and so far I've really enjoyed most of them.
Basically, the premise is that a user sets up playlists of 8 tracks each. You can skip a certain number per hour, but there's a limit due to music licensing ****. I've been able to listen through most of them in their completeness, though.
Here's a couple of them, if you want to check it out.