cryptex flash drive
DIY cell phone charger (TAKE IT ANYWHERE)
How to Type Symbols Using the ALT Key
Carpet Alarm Clock -- forces you to get up and stand on it to turn it off.
...this would be perfect to have in your purse, for whenever you cant find an outlet and your phone is about to die, like shopping, etc.
Couples' alarm clock - Put the ring on your finger and it vibrates to wake you and not your partner.