is getting MUCH better battery life. My MBP usually gets (on Tiger at least) 2-3 hrs....I've had this laptop for about a year and it has 96 load cycles on its battery. In Tiger, I used to time how long it took for the battery indicator to drop 1 percent, and it was usually just around a minute. Now, with Leopard, I'm getting 2 minutes and 30 seconds per percentage (brightness at lowest as well). At this rate, it says it'll last 4 hours (screenshot of what all that I'm running below). Also, and this might have something to do with it, my processor temp right now is 112 degrees Farenheit. In TIger, 15 minutes into using this laptop, it was usually at 133 degrees to 148 degrees (just doing normal stuff on it, nothing taxing). This is amazing. I love this OS.