I have been admiring the Yii website as a whole. I would be interested to know how you have set up the different parts of the site. Is it all in Yii or have you used a different CMS?
What are you using for the Extensions page? What did you use to make this page? Is it built on Yii? Same question for the wiki and live chat.
We are in the midst of building a Yii application and would like to model our internal website similar to yours.