have a look at http://nevermind.1speedcom.com/dnn  (though it loks offline atm)

I'm looking for somthing like on http://vitalvotes.com/blogs/public_blog/Teflon-Chemical-May-Cause-Allergies-22969.aspx 

It has voting, comments, and sub-comments ( which is the ability to start a thread on a prticular comment). I was told this is a modified community server install on a previous post. Also notice the friendly url. DNN should at least have the friendly urls built in.

On the link to the articles page it shows the number of comments, and the number of times the article has been viewed. http://vitalvotes.com/QA/QAHome.aspx . 

We may take this project on a build a module that replicates these feaures. If anyone is interested, please post comments with suggestions. We would also work with others on this and release as open source. I'd like to see DNN get some more of these community server features.

I was told the repository module has voting built in. Maybe that would be a good starting point. I envision this as a module you can drop on any page.