That link says a 'home' version a 'professional' version and a 'server' version for AMD. Does that mean different versions 64-bit XP than the one already available for Intel chips or are they just pointing out the fact that it will work on AMD chips as well as the current Intel ones?
x86-64 being developed by AMD is just 64-bit extensions to the old x86, IA-64 being developed by Intel is totally different and will be 100% incompatible with AMD's 64-bit chips and all the 32-bit 'Intel compatible' x86 chips.
Will the 64-bit XP CD that I am currently staring at run on AMD's 64-bit processor or will there be an 'AMD' version of it?
You have an IA-64 CD, unless it has an i386 folder you're out of luck. And even if it did, you'd be running it in 32-bit mode instead of 64-bit because AMD's Hammer can run both, unlike IA-64.