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8/7 - Intel may be changing the name of its 64-bit technology from EM64T (Enhanced Memory 64-bit Technology) to simply Intel 64. This latter name is more in line with what AMD calls their 64-bit technology, which is AMD64.
Regardless of the name, however, one of the most important changes that Core 2 Duo brings to Centrino is 64-bit computing. "64-bit computing now expands to notebook PCs".
Before, if you needed 64-bit, you had to go with an AMD mobile solution, or stick with a desktop. Now, you can have a 64-bit Intel notebook.
64-bit technology allows a system to address lots and lots of memory, say, if you need to render the fur on lots and lots of lemurs, as was needed for the film Madagascar.
64-bit computing is expected to come into its own with Windows Vista, which should also come in a 64-bit version.