I'm planning on buying a MacBook, but the reports of heat issues are kind of scary. Reading through all the reports, though, I noticed something. A lot of the reports of extreme heat seem to be at Apple stores where the machines are plugged in all day. So, I've got a question for any MacBook owners out there. Is there a difference in your laptop's temperature when it's plugged in or unplugged? My thinking is that perhaps the excess heat generation has something to do with the charging process. Just a theory until I get my own to play with.