Leonid Domnitser, 19 January 2010
A simple diffuser for your built-in popup flash.
Cut a ping/beer pong ball with a knife (careful!) and tape on index cards.
You can skip the cards, but they direct light forward and keep the flash out of your eye.
Unscientifically, I add about 1 EV.
No flash, high ISO:
Flash:
Diffused flash: