It was about time - in my humble opinion this is a move that should have taken place since the XP release!
I have spent hundreds of hours hunting and hacking 64-bit drivers for various laptops and desktops. In fact, the lack of 64-bit compliance from the early XP days led to peripheral/chipset manufacturers neglecting the development and testing of proper 64-bit drivers. This has left many of us, who do not wish to dump our perfectly performing but oldish hardware, with the early beta drivers that some (decent) manufacturers released under the pressure of 64-bit users.
I am running XP 64 bit since 2006 and I am not going back to 32 bits. Ever. I skipped Vista and I don't plan to move to Win7-64 before 2012. Unless a slimmed down n-lited version is released.