I get awesome battery life with my new i5 15" MacBook Pro EXCEPT when I start watching youtube. I swear I might get 2 to 2.5 hours of battery life then. My experience is still somewhat limited to MacBooks vs PC laptops. Here's my observation... For general web-surfing I can get 5.5 hours out of the Mac versus about 3 hours on my IBM laptop. However, I STILL get about 3 hours out of my IBM when I watch videos or youtube. Is there something I should be turning off when watching youtube?