The XKCD strip Heaven depicted a Tetris version that would drop irregularly shaped pieces that were perfectly structured to fill all the voids in the tetrisbed. Gud magazine responded by implementing this in Flash: a Tetris version that drops these eminently satisfying tetroids from time to time. They feel goooooood.
I write books. My latest is a YA science fiction novel called Homeland (it's the sequel to Little Brother). More books: Rapture of the Nerds (a novel, with Charlie Stross); With a Little Help (short stories); and The Great Big Beautiful Tomorrow (novella and nonfic). I speak all over the place and I tweet and tumble, too.