It's gonna be hotter than my metal PowerBook G4?

One thing I learned to deal with when I upgraded from my iBook G3 to my PowerBook G4 12" is that the aluminum casing did get hot..and I mean HOT! But I would say that most of the time it was just warm, even "cool" when just checking email for a short time...certainly not hot when it had just been sitting there in sleep mode connected to the AC adapter.
I was hoping returning to the plastic casing would mean not getting scorched and sweaty from a hot metal underside. If you are telling me this MacBook is WAYYYY hotter than my PowerBook, man, that sounds bad! Hopefully I will be lucky with my new MacBook.

Note:
"hot" = temperature is high enough to cause pain or at least discomfort
"warm" = not cool and maybe sweat-inducing, but no real discomfort/pain
Hi there! I have seen one MacBook so far, the black 2.0 GHz model, and it is much cooler than the PowerBook. I had a 12" PowerBook before (1.33 GHz) which, under some circumstances, got hot. When I say hot I mean pain.
Since I have had experiences with four MacBook Pros so far, two 15" and two 17", I was very interested in the heat problems. All of the MBPs are hot. If you stress them for a while, they will burn you. They will probably not cause injuries, but it sure does not feel good. However, the MacBook, as previously mentioned a 2.0 GHz machine, did not get hot at all. It did get warm – after 15 minutes of 100% CPU load it actually got very warm – but not as hot as the MBPs and not even as hot as my old PowerBook.
In conclusion: at 100% CPU load (2x100%, actually) for quite some time, you will have a very warm computer in your lap and you might feel a bit sweaty. However, it will not get hot ("HOT!") like the PowerBooks did. The MacBook does not seem to have the "hot upper left corner" either and the area above the function keys is just rather warm, instead of painfully hot.
Hope this answers your question somewhat. Even though this is a rather subjective matter, I think that I, with confidence, can assure you that the MacBook is at least not hotter than the PowerBook. I just wish that they could do something about the MacBook Pros... I am writing this with the computer in my lap and I know that if I had some background process chewing CPU for a while, it would start to hurt.
  Mac OS X (10.4.6)  
MBP 17"   Mac OS X (10.4.6)  

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