How to: calibrate you laptop battery (mac user only)

Saw this on Mactweeter on twitter, quite cool (haven't tried it yet myself)
It's supposed to extend the battery life.
Think going try it this week.

To calibrate your laptop’s battery:

1. Plug your laptop in and let it charge completely (your battery icon in the menu bar will be completely full and the charger’s connector light turns green).
2. Keep the laptop plugged in for another two hours (after it is fully charged).
3. Disconnect your laptop from power. Use it until it falls asleep from low battery.
4. Turn off the laptop and let it “rest” for about five hours.
5. Plug your laptop back in and let it fully charge.

For more info check this website: http://theappleblog.com/2009/05/29/how-to-calibrate-your-laptop-battery/