XP64 today is every bit as good as XP32.
99% of stuff works on it... There is a very small number of apps that I have that dont...
O&O DeFrag but then there is *** 64Bit version of that.
PAGEDEFRAG
PARTITION MAGIC
A very small number of games can be weird on it, but OTTOMH, all the games I have play on it great and in fact many games play better... FarCry etc looks way better on XP64 than on plain old boring XP32.
Driver support has improved 10-fold and while there is still some hardware out there that still does not work, the fact is, that the reason behind that, is that the hardware just isnt good enough to support so the companies have not bothered to release drivers for it... Well, I think so anyway.
I also find that XP64 has much better driver support for it at this time, than Vista does.
So, to say steer clear of it is a complete lie.
And as has been said... Corp Edition is, Like normal XP Corp, an illegal version floating around... You can only really get the PRO version ( There is no HOME version of XP64 )
And as for media center, this is a total waste of time if you ask me, its kind of XP Pro wit hsome stuff taken out, and a dire pile of horse cack thrown in, but hey, if you want a seriously slow poor pile of cack Media center on your PC then Windows MCE is the way to go.