Note this date: 2013 December 16.
If you already know the Cheapduino then you will know how small your project could be with that thumbnail sized board.
However, here comes the new one. DFRobot calls the new board BEETLE considering the size and the number of the pins you will get :-) The new Beetle board will come with a Atmega32u4 for the convenience of USB interface, more memory than its predecessor the Cheapduino. Another very cool and useful feature are the pads on its back, where you are able to direct access additional I/Os as well the RX/TX pins.