I own an aluminum MacBook from 2008. I just installed Snow Leopard on it, and after a full charge, it says it only has three hours left. While on a full charge on Leopard - it would have five hours left. This thing ain't even a year old. I've not raped the battery with electricity. Normal use, this happened exclusively after installing Snow Leopard. This is wierd. I though Snow Leopard was supposed to be using less power, or perhaps it's oposite? Does anyone know?