First test run for my Raspberry Pi powered bot inspired by cymplecy's blog (http://cymplecy.wordpress.com/). I found the magician chassis on a hobby site and was then directed to the blog by a friend. cymplecy used Scratch to program the Pi, I have once again gone for the Pi4J library to control the GPIO port from Java code, running inside a Jetty servlet container.
Apart from it's going backwards, not to bad for a first run.
Screenshot from the Android application running on my Nexus 7. The forward and turning speeds can be adjusted and a status is displayed in the lower centre of the screen when a new instruction is sent to the Pi.