Nice article by Walter S. Mossberg.
I also found Uwe Rueckeshaeuser’s comment very interesting:
In my own “test” the battery in the new 15″ MacBook Pro lasted 8 hrs and 15 minutes using 50% brightness, WiFi on, Bluetooth off and Energy Saver on. I played music most of the time and used the browser, email, office programs [...]
Battery Life on the new MacBooks