This isn't a complaint, merely an observation. I own two macbooks at the moment, a 2007 white macbook (2 ghz, rev 3.1) and a new aluminum macbook (2.4ghz, rev 5.1). Anyways, I put them side by side and ran some "tests", I compared the screens, the speaker quality and the temperatures using iStat Pro. CPU: The result was a bit surprising to me: the white (older) macbook ran at an average CPU temperature of ~86 degrees while the new alu one ran at ~96 degrees fahrenheit. Fans: Old macbook avg RPM: ~1800 New macbook avg RPM: ~2000 So in conclusion, the new macbooks ARE hotter even though their fans run at higher speeds. Can anyone explain this? Wouldn't this impact battery life? I might mention that all this was basically while browsing the web, playing music in iTunes or idling.