Kindle Skills - Version and Serial Number?

How to tell:

With your Kindle turned on and on the Home screen, press the Menu button. Toggle down with the 5-way button (Kindle 2) or press the down button in the 5-way navigation buttons until you see Settings underlined. Press in on the center button (or the 5 way toggle) to see.

Your Kindle serial number and software version will be at the bottom of the Settings screen.