Until I can figure out how to eliminate the mouse glitch and random stuttering in Portal, I won't be buying HL2. I personally don't think a 64 bit client is necessary, because probably about half the games on steam have no 64 bit binaries and never will. Steam as a client software has no use for extra registers - the most CPU intensive thing it does is the backup feature, which is generally held back by disk before it is by CPU.
No announcement yet.
Half-Life 2 Games Released For Linux On Steam