http://twistedmatrix.com/trac/
Part of the reason it is so awesome is because you just can't beat the name "Twisted" for any project. Maybe I'm just a little... you know...

Anyway... here's what the project is going to use:
A central server written in Python. Python allows for rapid prototyping and creation of applications, hence why I chose it.
Web-based clients that will be using AJAX to communicate with a PHP backend.
So far, it'll probably require Firefox 2 and IE 7 to operate correctly, depending on the limits of the AJAX engine.