MOTM

You can also use http://www.allmusic.com to search by style, including:

Electronic
Electronica
Progressive Electronic
Electro-Jazz
Electro-Techno
Electro
Neo-Electro
Electro-Acoustic
Electro-Industrial
Experimental Electro
etc

Also, you can search for a band that you already know and like, and then
follow links to research similar artists.

Another one is http://strawberrybricks.com -- it's all prog, but has a good
bit of obscure EM as a result.

Both of these sites grow daily it seems... :-)

best,
- Scott
____________
http://www.red-noise.com
http://www.strawberryplanet.org