I just put up a bit of a HowTo on getting iTunes 8 installed on XP x64. As linked from the HowTo, http://yukichigai.googlepages.com/iphonex64 deserves most of the credit for the magic to make the installer work. However, I couldn’t find a direct download link for iTunes864Setup.exe and I did spend quite a bit of time on that part of it. Hopefully it will help someone else out too, even if it’s just getting the direct download link.