I've only seen a couple of MacBook Pros at CompUSA, but they were sitting beside current PowerBook G4s and, while I couldn't hear anything specific, the MBP was far cooler than the PowerBooks.
It's rare that my 15.2 inch PowerBook is not rather warm. I expect that with both cores running in the MBP, it's somewhat warmer than my PB but not by much, even for the 2.16 GHz models. AltiVec runs hot in the G4s. (Of course, it's much better in the G3s. )
If everything is operating properly, I don't see that there is a problem with any of the new MBPs. They're great machines, even when they run WinXP.
It's rare that my 15.2 inch PowerBook is not rather warm. I expect that with both cores running in the MBP, it's somewhat warmer than my PB but not by much, even for the 2.16 GHz models. AltiVec runs hot in the G4s. (Of course, it's much better in the G3s. )
If everything is operating properly, I don't see that there is a problem with any of the new MBPs. They're great machines, even when they run WinXP.