My sister's MacBook gets really hot way easier than my MacBook Pro. Hers is a 2008 pre-uMacBook, and mine is a late 2009 uMacBook Pro. My fans hardly ever kick in even when I'm doing tons of multitasking, but when my sister is hardy doing anything her MacBook's fans sound like a jet engine... So why is this? The only thing I can think of is that mine has way more heat resisting foam (or whatever you call that foam), and that mines aluminum and hers is plastic... Any ideas anyone? Thanks!