Cool, 3.5-4.5 sounds like about what my old TiBook will do with a new battery. I was wondering when someone at Macworld would unplug the power adapter and see how much time is left. :-)

It's amazing how much less battery life PC users are accustomed to. Unless you get one of those thin PCs that are optimized for low power consumption, you're stuck with around 1.5-2.5 hours of battery. I can't remember the last time a stock Mac laptop would last for less than 3. Then again, for how much those replacement batteries cost, they should last awhile. It sounds like things are starting to turn around on PCs though. I think it's the new Acer Core Duo that lasts for 3.5 hours, which is pretty good.