Monitoring the state of your battery!
Laptop batteries usually degrade rapidly, but it's hard to tell unless you precisely calculate how much time it lasts every time you use it. I used to monitor it using a great application called CoconutBattery. It unfortunately doesn't work in Leopard and it hasn't been updated yet. I found this alternative that was updated recently called "Battery Health Monitor". You will get the "Original Capacity", "Current Capacity", "Current Charge", "Charge Cycles" and "Voltage". One thing to keep an eye on is the number of cycles. According to Apple, the battery should still provide 80% of its original capacity after 300 cycles. You can also check out the "Current Capacity". Depending on what that number is, you might be eligible for a free battery replacement if your Mac is still under warranty. The result for my MacBook came out pretty weird, I didn't know a battery with over a hundred cycles could have more capacity than the original capacity. You can get more info or download Battery Health Monitor here from MacUpdate.