The only thing I need the x64 functionality for is mame. I would use dos64 or even make a hackintosh64 if I could get light guns to work with that and mame. As for mame boxes go, who cares if there is crazy driver support. The only thing you need your mame device to use is your on board functions, and a keyboard.
I completely know that xp64 has horrible support, and I really could care less. The challenge of just getting a 64bit os running just right is about 99% the fun of it for me. I am lazy and would love to just install a 32 bit xp, but it is getting old. As for vista, I do understand that it is a cliche just to make fun of it, when everyone else is. But I personally hate it, it is bloated crap that takes even longer than xp to get 100%.
But for the sake of this simple post, and the fact that it is 3am, and I most positively am not making sense , just look at this driver please.