
Centrino Duo is the Mobile version of Core 2 Duo. At least, that's what it is called sometimes.
Centrino is a platform, not a CPU. It is not the mobile equivilent of Core 2 Duo or any other Intel processor for that matter.
To be branded Centrino (ie, to have that sticker on your hardware), you must have the Intel Wireless card, Intel Northbridge and Southbridge and Intel Mobile Processor. Thus, you can have laptops with an Intel CPU but not branded Centrino because they may use their own wireless card or chipsets.
I think quad-core mobile chips are coming next year, with the release of Nahelm (Core i7) which will be the next big revision of the Core processor series.
I seen laptop with quads :S
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