This project is about to build a small and tiny (48mm x 19mm) development board based on a Freescale Kinetis K20 device (ARM Cortex-M4 running at 50 MHz). The microcontroller pins are on the outside to use the board with a breadboard. The board includes the option for an micro SD card, 32 kHz clock and a 3.3V DC-DC converter. The ARM Cortex can be debugged with standard development tools (Eclipse, GNU, SWD).
Example projects available for Eclipse (GNU ARM Eclipse with GNU lauchpad)/Kinetis design Studio.