Between now and February, you can download their Best New Music of 2010 iTunes playlist for free. Just open up the iTunes store, choose "Redeem" under Quick Links, and type in this code:
I just downloaded mine, and it's got everything from R&B to classical to rock. I can't wait to find at least one new favorite.
And if you're looking to get in the holiday spirit, check out the Jingle Jams NPR Holiday Mix and peruse more great holiday music playlists on their site.