my macbook lasts very well, and even better depending on what energy profile I have it set to.
I've found that:
OSX lasts longer (I managed to have it going for about 6 hours once! just playing music, I had it on all day at uni during a workshop and just paused it every so often, but I also took some photos and video with it too) and I'd say my average is 2.5-3.5 hours
Windows vista ultimate Bootcamped tends to last about 2.5-3 hours on full charge (but will almost always get you through a film in fullscreen, because of power management kicking in) - Currently booted in Vista, 94% battery claiming to have 2.5 hours
The macbook charger and battery REALLY impress me, so easy and portable, the charger has exchangable heads (so can take abroad/plug directly into wall, rather than have the unit lying on the floor) and flick out arms to wrap extra cable around (and it's a very generous length of cable you get) as well as easy fuse changing should you need to, the battery also has 5 LED's on it that flash when charging and a simple button press will give you a rough idea of how much battery you have left (each LED being ~20%)
I hated the macs at my college, but love it on my laptop, at college they were slow and unresponsive, this thing (bearing in mind I only have a little macbook, not the macbook pro or anything) is snappy, light and responsive
and premiere pro is on macs now too for your video editing
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