I installed XP Service Pack 2 last night for the second time after rolling it back previously.
The first time I installed it I couldn't get my Netgear MAlll wireless 802.11b USB device to work, I've since installed it on various other XP machines and with each install i've had different issues with the device.
I learned fairly early on that the supplied Netgear software wouldn't work under SP2, instead you have to opt for Windows XP wireless configuration, which incidentally has been slightly improved since SP1. Having said that it's still not perfect, since you have to enter your WEP in manually rather than use a password to create it like the Netgear software.
There are also issues with driver installation when you do a fresh install of XP and patch it with SP2 before installing the MA111.
The joy of computing :)