ExtraCore is a 1" x 1" 22 I/O pin Arduino Compatible. It's 1.7 grams and 16mhz of tiny Arduino style coolness. Read more
This project was successfully funded on September 9, 2011.
I'm working on a new Arduino compatible platform. More about that in a later update. In the meantime here is a little Instructable about how to make an IR proximity sensor using an Arduino compatible and $2.42 of components.
By the way, has anyone made a cool project with ExtraCore? Feedback and photo's would be appreciated.