This ratings widget has been under a closed beta for some time but they finally made a public release today.
Outbrain Ratings widget is light, requires no registration and intuitive - visitors can hover the mouse over the five stars and click any of them to rate your current blog post.
Even if you have a regular website that's not a blog, this ratings widget can be installed on your site as well.
You need such a rating widget to get feedback from all those reader who are subscribed to your blog aren't contributing to the discussion because they are probably too lazy to write a comment.
Give them a system like this ratings widget that requires no effort and they'll be happy to say if enjoyed or disliked reading your blog post. Get the Ratings Widget here.