Brian Arduino
Brian writes-

Using the VonHippel module and a simple c program compiled for the ARM, BUG can talk to the Arduino (in the picture, the USB cable and USB to serial chip on the breadboard are probably superfluous as the VonHippel has serial on it).

Interesting and inevitable, an open source hardware project (Arduino) talking to an open source hardware product (BUG Labs). You can also think of this as a $349 shield for Arduino that can do almost anything.