This project is a completely home-grown implementation of an aircraft tracking system using Mode S messages received on a Universal Software Radio Peripheral (USRP) from Ettus Research. The system comprises of a software-defined baseband decoder, a GUI front-end and a real-time (smooth) JavaScript-enabled Google Earth feed.
For the Mode S/aviation/RF enthusiast: If you are interested in various notes, diagrams and screenshots that are more technical than these series of pages, please check out the dedicated page on my wiki as well.

The AviationMapper desktop app

Live streaming JavaScript-based (not KML) feed in Google Earth
Click on a book section in the top left (or below) to explore the project further.