Later this year Intel will release quad core versions of it's Core 2 and Xeon processors that are pin-compatible with the current two core versions. The folks over at Anandtech dropped quad core samples into a Mac Pro and they worked just fine. I suspect that upgrading your Mac Book Pro would be dicey due to power and thermal issues, but upgrading Mac Pro towers should provide quite a boost for well-threaded applications
Quad Core Upgrades for Apple
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