Braingell Radio
Been listening to it since like 2001, it's by far the best metal station i've come across.
Totally free station, has like 12 rotating DJs from around the world, and has something called "The Loop" which plays the owners COLLOSSAL collection of music. Has taught me so much music that I now consider important, you should defo have a look. Also, see if you can get on at the same time as a DJ, not only are they funny, but they intreract in the chatroom and take requests, do shout outs etc.