A great source of reviews and interviews, and a great center section where you can order tons of improvised, jazz and new music.
Signal to Noise
Trilogy radio show, with Emily Hay, Bonnie Barnett (avant-jazz vocalist) and Michael Davis (jazz/new music writer), is an important L.A.-area show for new music and left-of-center jazz. The station also host some other great stuff like Professor Canteloupe's Glossolalia, etc. I've had some life-changing moments listening to this station (no lie!).