there should be an HCL (hardware compatability list) on MS's website. I wouldn't be too amped about it now since I don't forsee a lot of people making 64bit drivers until vista is released.
Are you installing it on the PC in your sig? Almost any fairly new motherboard that has an NIC built in will either work with XP Pro x64 automatically, or have 64-Bit drivers available on their website.
my cable is connected to my wireless router which 4 members of my family yuse aswell so i cant unplug the cable and put it ini my mobo otherwise my family members will get pissed at me