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I'd love a quad core laptop... that will probably be my next laptop to get.
After 4, it will most likely go to 8 cores. You can get the Mac Pros with up to 8 cores right now, I believe.
 
Its hard to imagine needing 8 cores the os will be very graphical etc!

Considering heat issues, it's easier to make more cores then increasing the clock rate. CPU with high clock rates have high watts rate, while an equivalent speed CPU with more cores will generally have better heat and power consumption.
 
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