Macbook - Macbook Heat

I know a lot of people here are saying that the temperature issue will probably be fixed with a new revision of the MacBook. Why do people assume this?

I had a Rev A 15" Powerbook Aluminum and my roommate ended up getting the latest 15" Powerbook Aluminum, not sure what Rev it was, but it was the one that came out before the MacBook Pro's came out. I noticed no temperature change between my Powerbook and my roommate's. As a matter of fact, his ended up getting a lot hotter than mine.

I'm not sure if temperature was an "issue" with the Powerbooks, but it definitely wasn't something that I was willing to keep on my lap for extended periods of time, just like my Macbook. So from my personal experience, I never noticed Apple fixing temperature issues with later revisions. From my example above, the temperature issues actually increased. Probably b/c the clock speed kept climbing as newer revisions started coming out.

The only way I see Apple lowering the temperature in the MacBooks is to lower the clock speed or start using new Intel chips that run just as fast, but just cooler. Apparently new ULV Core Duo chips are coming out, but they're running at around 1Ghz.