Snow Leopard is also full 64 bit top to bottom, just not for all current machines and single DVD of Snow Leopard contains OS that is capable of running both 32 bit and 64 bit kernels without any hacks. WOW64 is a hack on the other hand I can run both 64 and 32 bit apps on Snow Leopard no matter what kernel is currently loaded 32 or 64 bit.
I was using latest beta. Clearly it's way better than Vista or XP, but for me after using Leopard for two years I very much like Mac OS X UI and how simple it is and I can work faster with Spaces and Expose also Quiclook. It's in my blood now I love my Xbox 360 it's a fine game console though hardware could be less faulty.