Maximizing your Battery Life

Battery life is a very important aspect of any portable computer. According to Apple the newest iBooks get up to 6 hours on a single charge and the various Powerbooks get anywhere from 4.5 to 5 hours on a single charge. Ambrose, my year old Powerbook, is clocking in at a hour of power on a single charge.

Now, I am sure this is mostly due to my negligent attitude towards my battery's health. I leave Ambrose plugged in more often than not, and that isn't the best thing to do for these batteries. What is the best thing to do to keep your batteries in tip top shape?

Apple has a special section all about batteries on its website. 
Quoth Apple in the section about notebooks: 'Apple does not recommend leaving your portable plugged in all the time. An ideal use would be a commuter who uses her iBook on the train, then plugs it in at the office to charge. This keeps the battery juices flowing.'

Check the page for all sorts of tips about battery life.

After reading all this information I figure I must not be the only bad battery dad on the planet. How long does one charge last in your Powerbook or iBook?