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Where 64-bit Windows will have problems is that there are hardly any applications which are 64-bit ready, so you will be running virtually everything in 32-bit emulation mode - with no advantage over your current setup. Also you may come accross other problems: for example, there is no 64-bit Flash plugin, and the 32-bit one may well not work for a 64-bit IE (the 32-bit Linux version certainly doesn't work for 64-bit Firefox or Konqueror).
I would suggest sticking with your current 32-bit Windows version for the time-being, until you have a better choice of applications which will make the switch worthwhile. Others who have tested the 64-bit Windows XP might be able to give a better answer.
I got XP 64-it from a friend and got excited, cause he said that my pc should be faster. But after reading some articles and threads, I found out what you've just menioned. Less RAM isn't a problem, it's that all apps are 32 bit. I read that it's possible to install some divers to run 32-bit programs, but I decided that it's not worth the hassle aslong as majority of apps are 32 bit. Maybe after 2,3 years things will change to 64...
Thanx again for taking time to answer. Good luck.