Joystick-It Arcade Stick
What it is: The Joystick-It Arcade Stick is an adhesive joystick for playing games on tablets.
Why it’s awesome: You can attach this joystick to any touchscreen and remove it without damaging your tablet. It will work with any game that has an on-screen control pad, giving you enhanced precision with a retro feel.
Where to buy: ThinkGeek