The Linksys WMP54GS works in Windows XP Pro x64 (and XP Pro 32-bit) - how do you think that I'm here writing this? ;)

It must be a v1.1 (min. I would think) and uses, again, the Ralink RT2500 chipset.  It is a bit of work as the drivers must be installed manually but no problems here.  It may be that they have fixed this as the Ralink pages and drivers have been updated since I went there last.

ETA: It is a shame that Linksys, a VERY large company involved in wired and wireless network and internet hardware solutions, seems to have decided that 64-bit drivers aren't really worth making.  Considering that there are now a dozen or so 64-bit OSs out there (including Windows XP Pro x64, several Vista 64-bit flavors, Linux 64-bit which has existed forever, and NOW even MacOS X 10.5), you'd think that they would get the hint.  Okay, when x64 and Vista were beta not as critical.  They have been released for over a year now.  All of us 64-bit users should just flood them with requests for 64-bit drivers until they can't tolerate it anymore.  Then maybe they'll get off of their laurels and do something about it...

C makes it easy to shoot yourself in the foot. C++ makes it harder, but when you do, you blow your whole leg off.

 -- Bjarne Stroustrup

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