Create something similiar to Yahoo Answers but much simplier

I like to do a site similar to Yahoo Answers but much simplier in terms of features. Requirements are: * Rating of answers * Upload of images * Featured Question of day * Tagcloud of all questions * Users can be anonymous or registered * Users can send email messages to one another anonymously if they want * Statistics page to show people who answered the most and newest questions, oldest questions, hardest questions, etc * Ability to filder types of questions and answers * Ability to edit question or answer Important thing is speed of searches and voting, clicking around, and posting information. It should be a web 2.0 app with AJAX libraries such as scriptaculous, JSMX, Mochikit, XAJAX, or others. You dont have to worry about design. Just need you to do backend programming and use DIVs and I'll style everything myself later. Site I really admire for its speed using AJAX is [login to view URL];Seri-MX;Core4;AJAX