There are a few groups like Digster that publish curated playlist for specific genres of music. OKP would be soo much better at this then some of the turkey's doing it now (e.g., Digster's Essential East Coast Hip-Hop mix which has over 2K subscribers is embarrassing).
All it would take is folks claiming a genre/playlist, publish it for review here, folks commenting on it and making suggestions. And then publishing all the playlist together under the OKP Banner/Brand name.
I maintain that Spotify will be huge one day. Folks should get in on the ground floor.