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Basically useless. I don't see Apple doing this until earliest 2009.

There's no way the extra performance will be worth the sacrifice in battery life and heat...
 
It won't happen, dream on. look at hot they are now it would burn the hell out of ya The Core 2 Duo is already a pretty hot processor imagine a Core 2 Quad. Intel told people that this was to be a gaming or multimedia laptop processor not for an inch thick laptop. This maybe a good candidate however for the 24" Extreme iMac, but not the pro for at least a few years.
 
Quad core was developed for desktop machines, the cramped quarters of a laptop aren't fitting to a quad core.
 
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