i've got the ultimate 13 inch mba (2.13ghz, 4gb ram). when browsing the internet, checking mail, or looking at photo's my cpu temp goes between 50-60 degrees. however, when i start editing video in imovie the temp jumps right up to the high 70's. skype is even worse, and after just 2 minutes on a video call my cpu is in the mid 80's. is this to be expected? and what kind of effect is running consistently in the 80's going to have on life expectancy, performance, and battery life? thanks.