I had previously created a post in the "Share Your Projects" section for this, but decided that the 3pi section is probably a better choice. Since I've already posted it here, I'll keep this brief.
I've created a website for an endeavour I call Project Tabletop, where I offer video demonstrations, source code for exciting 3pi examples (such as grid-based navigation, reading of text messages encoded on line courses, or wireless remote control via a PC), and utilities to run under Windows (such as classifying received serial data in a .csv spreadsheet automatically, for easy graphing in your favourite spreadsheet program).
Source code, hex files and binaries are freely available. The website is called Tabletop Robotics.