Mac users interested in K64 enabler for macbook generally download:
K64Enabler lets you enable / disable the 64-bit Kernel of Mac OS X 10.6 Snow Leopard.
By the default the 64-bit Kernel is only enabled on server configurations.
Note that regardless of which kernel is used, Mac OS X can run 64-bit and 32-bit applications concurrently.
You need a K64 capable machine to enable the 64-bit Kernel.
