If the last time you talked about how many bits something had was when you got a Super Nintendo, you’re probably as puzzled as I once was about the whole shift to 64-bit computing. Isn’t that the computing power of a Jaguar, not a Snow Leopard? No, silly goose. It’s very technical and I don’t pretend to understand it all the way, but essentially the 32-bit architecture that has been in place for years in x86es limits the maximum amount of RAM you can have, and its effectiveness.
64-bit architectures are available but not widely taken advantage of, and Apple aims to change that somewhat with Snow Leopard.
Read more at Apple Insider, and keep an eye on it because there are two more installations of the extended article to come.