Downloaded XP Pro X64.
It actually worked out nice, I had a 250gb HDD partitioned into 2 equal partitions.
Left regular XP on C: and installed XP X64 on D: Now I get a promt at startup asking me which to run. Very nice touch.
I ran SiSoft Sandra under 32 bit windows and 64 bit windows, there is a decent improvement.
No problems so far on running 32 bit programs under X64. Even installed Doom 3 and noticed no loss of performance.
Macromedia Flash and other browser plug in's aren't supported yet, that I have found. But thats livable for me.
As far as looks, layout, usabililty, ect. I notice no difference between the 2. I'm keeping it for now and dual booting, if anything else I can use it to play games on and use 32 bit XP for goofing off, web browsing, ect.
BTW, the trial priod shows to be 183 days, 6 months. Hopefully by the time the trial period ends, all the stuff that isn't supported might be. If so, I'll buy it. I like it so far.
My 2 cents for what it's worth. Try it, dual boot and you loose nothing.
One more thing. It could come in handy. Both OS's can see all files on both drives, so if I do have a catastrophic crash with my original windows, I can still backup my files with XP X64 before doing a reformat/reinstall. Could come in handy