I forgot my power cord today, I easily lasted the morning until lunch on my charge. But then i realized that I would never make it through the afternoon. I charged up over lunch on a colleague's powercord, and now with email checking, web browsing, MS word and Excel, (and some ichat, hehe), i have got 4 hours of continuous use on a half-dimmer screen. And the meter is telling me its good for another 45 minutes. This is really awsome considering that I have two batteries. I can potentionally get 9+ hours of this type of work while running on reserves. Obviously, it wont last that long if i were playing movies, or even mp3s...
Patrick