So I'm a student and have an iBook G3 500 that has been just great. But recently I've had the horrible problem it tends to have where when the screen is opened too far, the backlight on the screen goes out. And I need a new computer anyway. The question - should I buy now? I'm looking mostly at Powerbooks but a little at iBooks. I could wait a month, maybe, but not much longer - does anyone have any educated guesses whether or not we'll get a revision by then? I'm especially curious because the new iMac seems like such a ridiculously better deal than the present laptops (if a little less attractive and convenient) so I was hoping they'd update them too. I really want a sweet computer, and the buyer's guide isn't much help. Any help you can give would be appreciated.