http://pseudo.com/ssound/   among other archives available is Giles 
Peterson's Worldwide show
http://www.betalounge.com/  mas musica. the whole spectrum. Great site 
except for all that needless chatter from the hosts before every broadcast. 
Less talk, more music. But, I shouldn't complain--it's free...
http://www.thewomb.com/  more on the housey/techno side, but there is some 
drum and bass and downtempo. They stream live too. If you've got a fast T1 
or similar, check out the 80k real audio, the sound quality is nice.
also X-Radio has a jukebox feature that I use frequently. You can listen to 
a random selection of songs in a particular genre. Helps you research new 
stuff to buy:
http://www.x-radio.com
happy streaming
gordon