Qwench - PHP StackOverflow Clone

Qwench is a PHP/mySQL based StackOverflow clone.

Features
1. Allow users to post questions and answers
2. Points system similar to StackOverflow
3. Ability to post an article as a knowledge-base (for corporates)
4. Ability to lock site to registered users only
5. Clean CSS layout
6. Works in all major browsers

Demo
http://anantgarg.com/qwench/

Download
http://www.mediafire.com/?dhmrmyefxp1bua6