1) How long is battery life when watching a dvd(full brightness/40% sound) Can I watch a 3hr movie like King kong? 2) Keyboard backlight(I love that) will it work on the windows side? 3) I would be using the Macbook 95% windows and 5% mac (work related) Do you think this is a bad idea? As in too many issues/bugs on the macbook windows? 4) I had 12in powerbook before and I HATED the screen. Is this new screen much clearer?