I wonder if this nVidia chip is really more power hungry than I thought it was. Recently I was asked to actually give the Lord of the Rings trilogy a try. $3/per movie rental isn't bad, so I decided to give it a shot. I did the first two movies on my MacBook Pro 17", the third on the iPad, as a test of some of the claims that the iPad actually exceeded its rated battery life when playing videos. From a full charge the MBP was near dead after Fellowship of the Ring. Same result from Two Towers. This is with nothing else running or open, screen brightness three notches down from max, volume max. From a full charge the iPad was 30% down after Return of the King. That means that in theory, I could have watched all three movies at a total of around 10 hours and still had a little juice left. This is with screen brightness at around 75%, volume max. The question though is why? Does anyone know the true technical details behind this? I don't expect the MBP to run full screen videos for 10 hours, but I would have at least expected it to last the 6-7 it would take to watch Fellowship and Towers back-to-back. Next time I watch massive movies (like, never) I'll test with gfxCardStatus forcing the Intel GPU and see if it makes any appreciable difference.