ArduinoDashboard is an application for viewing analog and digital pin sensor values from an Arduino in real time. The app requires you to incorporate a function from ArduinoDashboard into your sketch and upload to the Arduino. You then run the ArduinoDashboard app on your PC which reads the pin status data from the board via 9600 baud serial. The data is displayed on a GUI as shown above.
You can download this app, source code and documentation at the LVL1 Hackerspace site.