The edit box doesn't seem to indicate what sorts of markup, or <i>"url looking thing is converted to link"</i>, etc, is available. Might be good to have a little help box to explain what's allowed/supported, even if that's just text.<p>Edit: I now see the "support markdown" commit. You might want a "preview" button so people can see what they have. At the moment I see only a "Post Comment" button.<p>Also, does it understand the concept of canonical urls so that pages that are the same one, but with different urls, share the same comments? I searched the repo for "canonical" and didn't see anything.