One of the best ways to let your users say their opinion except from the comments area is by rating systems in your blog. here are the best plugins we found:
I Like This
This plugin allows your visitors to simply like your posts instead of comment it.
Adds an AJAX rating system for your WordPress blog’s post/page.
GD Star Rating
GD Star Rating plugin allows you to set up rating and review system for posts, pages and comments in your blog. You can set many options for displaying the rating stars, and also add widgets into the sidebars for displaying top ratings and other statistics generated by the plugin. Plugin includes advanced settings panels that will allow you to control many aspects of rating. Plugin also supports multi ratings along with thumbs based ratings. Plugin supports use of cache plugins and dynamic loading of data using ajax.
If you’re tired of moderating readers’ comments on your blog, stop doing that and let your readers decide which comment deserves to be shown. If you’re getting outrageous comments on your blog, don’t get too angry yet. Let’s see how many readers feel the same. You can do these tasks (and more) with the Comment Rating plugin.
DS-Rating for WordPress
DS-Rating is a plugin for wordpress that gives you the ability to add a rating to posts, anywhere from 0 to 5 (including half steps). Note that this plugin does not allow users to rate posts when browsing a site – It is only set up to allow publishers or administrators to add ratings when creating or editing a post.
WP Digg This
WP Digg This is a plugin that adds a Digg button, but with a twist. Instead of adding a Digg button to all your posts, WP Digg This plugin selectively adds the button only to posts you want.