So I've heard that Leopard is going to be native 64-bit OS and currently Tiger isn't. I've also heard that the Core Duo Macbook isn't 64-bit but the Core 2 Duo is 64-bit. Soo... when Leopard comes out, will there be a significant advantage to running a Core 2 Duo laptop versus a Core Duo? (64-bit Vs. 32-Bit) Also how are applications going to work since they need to be coded for 64-bit or 32-bit? Thanks.