There are alot of superb songs featured in The Orange Box (available on PC, X360, PS3)...

I've just been discovering the songs on youtube recently... But here are a few great ones:\

Sector Sweep (don't click it away during the intro, it gets great...)

Portal ending (very funny song with the robot from the facility singing).

Hunting Party (Very Raw song...)

And there are MANY more... There's a guy one youtube who has put up all the songs... His name is No1MechWarrior

Just give it a check and a quick listen and then tell me what you think about it!

If you want more exposure you should post this in the gaming section as this does relate to gaming.

Yeah it does have a great soundtrack. If you buy Audiosurf on steam you get the whole soundtrack for free with the game ($10).