If you like trance, try these:

http://87.230.84.182:9000 http://87.98.129.202:9000 http://77.221.139.178:8000

I wouldn't say it's the best but recently I've been listening to http://www.tangerinedream.com and the chill selections at http://new.icebergradio.com

Don't listen to music. Actually it's bad for concentration, and working at 2 AM won't help too.

Oh ya, should mention check out http://www.live365.com I found it the other day and had some decent channels from what I saw. TONS of genre's. You can pay for it if you don't want commercials as well.

For Rock / Alternative / Some Punk:

Vancouver, BC: http://www.cfox.com

Victoria, BC: (lame java player) http://www.thezone.fm

I like thesixtyone.com for indie (and indie electronic) or di.fm for dance music (though I haven't tuned into the latter for quite some time).

http://www.pandora.com while it still exists. (What happened to that court case anyway?)

http://somafm.com - especially their Groove Salad or Digitalis mixes.

Go to shoutcast.com. I like the Alternative genre with 181.fm (the buzz) being my usual choice.

hypem.com