XP64 has progressed in leaps and bounds but quite a few annoying flaws remain and, from what I've read in the forums at Microsoft, there's no real dedicated effort with much of it. All their effort is for Vista.
I don't think I've ever seen the OS crash, but plenty of applications have..... and even after making WMP11 work for XP64, it still crashes just as much as WMP10 did.
Shit like this doesn't make me want to buy Vista, it'll make me buy Suse when XP64 is beyond it's time.