Kindle software update: adds battery life, PDF reader and horizontal reading support.

The Kindle platform is getting updated! Very good. The enhanced features include:

•  Longer Battery Life: Now read for up to 1 week on a single charge with wireless on, a significant improvement from the previous battery life of 4 days.

•  Built-in PDF Reader: Your Kindle can now display PDF documents natively. Native PDF support allows you to carry and read all of your personal and professional documents on the go.

•  Adjustable Screen Rotation: The Kindle screen can now manually rotate between portrait and landscape views.

Nothing to do on the device, the update is pushed down automatically via Whispernet.