Since I redid the layout of the site a few days ago several people have commented so I know the comment system works, however under the posts and next to the tags you used to be able to see how many comments where posted on the article. Now though you have to click the article to see if there are any comments.
I would like to change this if it's possible since I think it's easier to join a discussion if you actually see one going on.
Until I do fix it though you can still comment like usual by clicking on the post title.