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While the 64-bitness of AMD and Intel's new chips isn't useful yet, these chips are greatly beneficial for a couple of reasons. First, the extra registers that come with the x86-64 mode provides flexibility and performance. Second, DEP makes it easier to write secure software.
Now that I think of it, 5 - 10 years from now, 3GB of ram on a desktop machine will be fairly common. It's a good idea to start building up demand now, so the industry is completely ready once we start feeling the pinch.