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Battery Life | Test Description 

2:40          | 100% brightness, bluetooth & wifi onnormal web surfing
3:05          | 50% brightness, 50% sound vol., bluetooth & wifi, DVD playing
3:08          | 81% brightness, web surfing, word processing
3:44          | 81% brightness, no bluetooth, wifi on, web surfing

Also, I find that I'm able to easily get over 4 hours of normal use if I am extremely power-conscious (turning the screen brightness further down, turning bluetooth off).  Being able to get over 4 hours on a laptop is very good.  I'm fairly happy with the battery life of the MacBook C2D, though with a 3:05 time for DVD playing, I wish it lasted even longer (like long enough for two movies) since sometimes I take long airplane flights.

 See also my related posts:

Review: MacBook Core 2 Duo (C2D) - Part 1

Review: MacBook Core 2 Duo (C2D) - Part 2 - Performance 

MacBook Core 2 Duo (C2D) Review Update (Part 3)