I had a 64bit version of Vista on my old Compaq for a little while. Honestly, the performace was MUCH lower than it was with 32bit XP. And, as Justin_Time mentioned, most everything's still written in 32bit. Now, the little bit I used Vista, I didn't have any compatability problems(well, between 32 and 64 bit) but, I suspect there'd be some problem that would arise eventually...
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Desktop * Athlon X2 4200 | 2G RAM | 160G HD | 7600GT
Laptop1 * C2D T5550 | 3G RAM | 120G HD | Intel x3100
Laptop2 * C2D T5250 | 2G RAM | 160G HD | Intel x3100
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