With tiger, I was able to get almost 4:00 of life as I was just running firefox browsing the internet, or typing a paper. even when my mbp came with kind of a crappy battery that only has 96% capacity. after installing leopard, i can get 2:00 at the most. i have the screen brightness at the lowest setting, bluetooth off, keyboard backlight off, only FF running, and the tightest power settings. anyone else getting this? maybe the time calculation is just screwed up? i have been using it for about 30 minutes and it is sort of fluctuating a lot ranging from 1:43 to 2:13. its moving around more than i'm used to.