If your readers like your post, naturally the rating will be higher. If they don't then I guess you'll have to write about something else or blog about a different topic. Essentially, adding a 'post rating' option can help you improve the quality of your blog by leaps and bounds.
If you are lucky enough to have your own domain and use the Wordpress CMS system, you'll probably be aware of the post rating plug-ins for wordpress. However, if you use other content management systems such as blogger you'll need something more. The simplest, easiest and free solution that I know of so far is called outbrain ratings widget. It's a great free service that allows you to add the 'star post ratings' feature to pretty much all major blogging systems including Blogger, Typepad, Wordpress, Drupal and even FeedFlare (which is a service offered by FeedBurner).
You can even sign-up and even track the ratings for all your posts which is not available in any plug in I've seen so far.
Cool, huh? All you need to do is go to the outbrain website and click on the appropriate button and it'll let you know what you ought to do.
Got a question, tip or comment? Send them to email@example.com and we'll try to answer it in a blog post!