Notes from the Chandler Demo is an excellent introduction to Chandler. I tried their release 0.1 and while rough it is very promising. The Notes explain why the platform they build is promising. Based on wxWindows, Python, RDF and jabber, the architecture looks great and very flexible.
I'm just disappointed that they did not chose to implement this on top of Mozilla, which I think had already all the required platform features. I guess that performance, the choice to have native widgets, and the decision to use Python is what triggered their choice.
It's a great opportunity for me to give a try to my new abilities in Python, which I begun to learn 2 months ago and find a very exciting language.
They use Twiki for their wiki site: a very tasteful choice shall I say :-)