There's no reason that they couldn't put a desktop CPU in a MBP, but they currently don't, and Intel doesn't seem to have any plans to make a quad-core mobile CPU.
You won't see a desktop CPU in an Apple laptop because they're too big, too power hungry and too hot.
But you'll likely see a quad core sooner or later in a MBP, especially since they're on Intel's roadmap:
http://www.intel.com/products/processor/core2xe/mobile/index.htm Intel® Core™2 extreme mobile processor QX9300I read about this earlier this year, but I think they're only slated for 1Q09. Hopefully we'll see them in the 17" MBP.
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