Why does everyone hate Windows X64 when it doesn't look like any of you run it?
Every gaming benchmark I've seen shows that even 32 bit games run as good or a little bit better on x64, not to mention the fact that the rest of the Operating System runs on the rock-solid Windows Server 2003 SP1 kernel....
The only time you're going to run into driver problems is with crap like TV cards and other weird stuff.
EDIT: By the way, X64 is NOT in Beta.
Desktop machine: 2 x Opteron 246, Asus K8N-DL, 2GB PC3200 ECC Reg., XFX GeForce 6600GT, 74gb WD Raptor, 2 x 19\" LCDs, Windows XP x64
Server machine: Intel P4 3.0GHz 2MB EM64T, ECS i865pe, 1GB PC3200, 36gb WD Raptor, Windows Server 2003
Laptop: Dell Inspiron 9100 (Intel P4 3.2GHz 1MB Prescott, i865pe, 512MB PC3200, Mobility Radeon 9700, DVD+R/DL Burner), Windows XP
Linux: P3 450Mhz, 386MB ram, Slackware 10.1 (Running mySQL/Apache)