It seems rather strange that Apple would give us this "free upgrade". Doesn't it require them to open up each box, disassemble the laptops and physically change the CPU? On the G4 models, they would have to change the logic board. Perhaps these new laptops have interchangable CPUs? Or maybe they are just clocking the CPUs at a higher speed? Or did they decide this from the very beginning, as a stunt to kick off the new laptops? Perhaps they found a bug in the design, and used this "upgrade" as a gesture to buy them some more time? One quick question though, are there any design differences between the 1.83GHZ/2GHZ and the new 2.13 GHZ cpus? Are they part of the same family? Do they all output the same amount of heat? Perhaps they corrected some of the bugs in the Coreduo design?