You're sure yet you don't even use it?
Give me a break.
Unless you're running some really odd hardware, you're generally covered.
*** All nVidia Video Cards are currently supported
*** Most Creative Cards are currently supported
*** All ATI Video Cards are currently supported (even AiW)
*** Most onboard NICs are currently supported (Intel/Broadcom/etc)
*** Almost all past and present nVidia, VIA, and Intel chipsets are currently supported
*** Most/all generic USB devices (thumb drives, flash card readers, digital cameras, etc) are currently supported
And most importantly
>>> Any driver that came "in box" in Windows XP Pro has an "in box" driver in XP x64 <<<
My games work, my joystick works, my Logitech USB microphone works, my APC BackUPS 1500VA works, my digital cameras all work, my USB mice all work, etc etc.
The *ONLY* piece of hardware I am currently using that doesn't work is my Samsung ML-1740 printer. And those drivers are coming very soon. (However Samsung printers that have a driver by default in WinXP Pro have an "in box" driver)
Bottom line is, why don't you leave it to people who actually run X64 to weigh in before you all blindly pass judgement on it. There are plenty of people on this forum who are running it, and most people who run it think its great, including me.
Not to mention, XP x64 drivers are going to be compatible with Windows Vista. So, now with all the Betas out there, x64 drivers are going to be appearing like crazy. And no waiting until 2006 and paying through the nose for a brand new OS.
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)