I think top of the page (Yii framework writing and Yii logo is a little bit crappy). I do not like this logo even font which you've used there. Everything else on page looks nice.
Btw. If I can suggest something. Yii is developed for aplication which should be quick, large and powerful. Therefore I think logo should tell other people about that principles. I suggest to transform name Yii in logo into shape of locomotive (as a reference what I'm thinking about please have a look on this page - Polish Railway page: http://www.intercity.pl/
Why do not you do a design for us.
It's easy to put defects, but instead of just putting defect.
Show a solution.
Well this is my final design of the 8 that I created.
So for design, i think we need the following to be polished. Other things are minor and can be adjusted later.
1. the logo for example