I've mentioned Pandora Internet Radio in the past. The thing I really like about it is that you program it yourself by suggesting music you like and Pandora suggests music to you based on music you have selected.
Case in point: Mason Jennings.
Since Pandora suggested this artist I have picked up several of his CDs and have yet to be disappointed. Mason Jennings is a contemporary of Jack Johnson and has a similar style.
Check him out.
Tune in the weekend of 3 October for a very special edition of Land of the Zia, here's a sneak peek: