RaspberryPy is a project mainly written in ..., based on the MIT license.
An interactive set of programming lessons for Python, written in Python.
A Pythonic environment for learning Python on the RaspberryPi device.
See http://www.raspberrypi.org/ for details of the device.
NB: This software is in no way official or affiliated with the RaspberryPi project. It's just a quick hack to see how much can be done in as little time as possible at PyconUK 2011.