Contiki uIPv6
[Overview]
This project ran IPv6 over small wireless sensors. In this case the Atmel Raven hardware, though the code can run on many different platforms.
My work was primarily with the USB interface code (hardware pictued). The code written initilizes the device as a USB network interface, allowing the computer to easily send IP packets to and from a wireless sensor. The USB stick works on Windows and Linux, with the latter not even requiring any drivers! It can enumerate as a network interface, a serial port for debug messages, and even a mass storage device to hold documentation or drivers.
Jump to the Contiki Website for more info.