Amazon announced some major changes to their Kindle e-book reader today. Specifically, it stated that they've worked out a way to increase battery life by 85%. That means that the new firmware update will allow you to leave your Kindle on (with the wifi active) for about 7 days before you need to recharge. Additionally, the Kindle will now support Adobe's PDF format natively. Previously, you had to convert PDFs in order to view them on the Kindle.