Kindle tricks
Ars Technica has a useful article on Kindle … secret codes.
I don’t know if I care enough about how my Kindle looks when it’s sleeping (when it’s also usually inside a cover) to change the screensaver to an image of my own. But the other two tricks looked neat. For reference, screenshot is activated by Alt+Shift+G, and minesweeper can be accessed through Alt+Shift+M.