Not sure if any one else here is really into electronic music, or at least interested in hearing some.
I have been listing to di.fm for a couple of years (mainly the phychill / progressive stations).
Its free, and I find it really helps me focus on getting tasks done (as opposed to metal where my focus is mainly following along the guitars and drums).
There is a really nifty guide online that i used to explore the different sub genres of electronic music here:
Ishkur's Guide to Electronic Music | New Home on Techno.org
The one genre that really comes closest to metal (samples a lot of extreme metal) is Darkstep, there is a free radio station that allows you to legally download full songs here:
Interested to see if any one else listens to this stuff?
I listen to a lot of downtempo electronica... like you, i find it helpful for putting my brain into a state where i'm better able to focus on tasks.
I like SomaFM: Listener Supported, Commercial Free Internet Radio and in particular their Groove Salad and Secret Agent stations.