About himself, Guido Bonelli writes 'my mission is to expand upon an already awesome hardware platform by providing equally awesome and unique shields for the hobbyist, inventor, DIY’er or anyone else curious about Arduino'. His Dr.Duino™ board makes debugging Arduino as easy as programming Arduino! 
Forget now about spaghettis and juggling with probes. On the World’s first Arduino Breakout board, all Arduino pins are brought out to headers for easy probe access, even when your Uno is connected to one or more shields.
Build this clever debugging breakout board for your Arduino shields. It offers a RS232 connector with loopback mode, LEDs, potentiometers, switches, a piezo buzzer, a reset button and various easily accessible test points.