How to communicate with visitors

I am not talking about myself here - (though it'll help if more people communicated with me). ;)
This page gives a list of link to resources / tools (video, text chatbox, ratings, comments, etc) that one can include on their blogs to increase their communication with visitors.

I've always thought that including a tool for rating a post would be cool, because, it helps delurk people, without having them to type in text, negative feedback can be given without having to coin it diplomatically and questions with multiple choice answers are easier to attempt than those requiring a descriptive answer. I hope that Blogger provides this feature in addition to the comments feature.