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The improvements include the ability to switch between portrait and landscape mode in books and PDFs, instant translations of words and passages into other languages, and a text-to-speech feature that reads English-language content aloud.

Impatient Kindle Touch users can install the upgrade today. Here's how:

First, make sure you're not already running the new software. Go to the Kindle Touch home screen; tap Menu, then Settings, and Menu again. Select "Device Info." If the firmware version is Kindle 5.1.0 (as shown below), you're running the latest version and don't need to upgrade.

On your desktop or laptop PC, go to Amazon's , scroll down a bit, and click "Download Software Update 5.1.0." The file size is only 38.6MB, so the download shouldn't take long.