Old thread update: XPSP2 automatically picks this card as a Netgear WG511. The hardware vendor and device ID is 1260:3890 - generic FullMac PrismGT card. It works with many drivers provided by other manufacturers.
On the Linux side of things, it also works with the newer p54pci module [driver] (softmac and fullmac, newer), and prism54 module (fullmac, older). The p54pci module is the newer one, and automatically loads for this card, along with p54common.
What this means in normal English is if you install the current Ubuntu, 7.10, and update (as of this post), it works generally, with the following exceptions:
# Advice from the #prism54 channel on irc.freenode.net is to blacklist one or the other prism modules; I blacklisted prism54 (older); it is blacklisted by default in the current version of 8.04 [Hardy Heron]. The equivalent in windows xp is prohibiting a driver from loading.
# There is a bug in Ubuntu which stops the card from supporting channels other than 1-11 (US), with documentation on how to make the other channels work. https://bugs.launchpad.net/ubuntu/+bug/205095