Ok this is not talking about the performance or how 4 GB of RAM would determine if you need 64-bit or not, but the question is, When do you think developers will stop writing code for 32-bit Applications. We are on the verge of a major step in computing evolution, this happens so rarely, and I think the last time we saw a change was 16 to 32 bit in the early 90's? Point is, I'm in the market for a new computer, my current one works, but is ailing and I want to buy something that will last with software support. So, since we are about to introduce 64-bit chips (again) into the new mac line in Q3 of this year, will we see a major reduction in the next few years for 32-bit app support that would in effect leave my computer unable to use newer apps, or will we always see continued support for 32-bit apps?