There's indeed very little 64bit (consumer) software for Windows available, so you won't really profit a lot from the 64bit extensions. That's too bad.... as 64 bit software can, in some situations, give an enormous boost in performance. For now, XP64 isn't that interesting. I think I'll install it next time I need to reinstall my Windows system, but I wouldn't want to spend much time on reinstalling everything because of XP64..