sageshilling

Like Cheese provides a number and an image of a heart beneath site images; 
hover on the number to see the display names of past visitors that liked the image. 
Visitors can register like/unlike your site images; heart image changes accordingly. 
Uses Nextend-Facebook-Connect to allow for easy Facebook login and gain approved valuable site visitor information. 
Provides additonal image fields in the media uploader.
demo <a href="http://peaceoftheocean.com/shesellsseashells" rel="nofollow ugc">http://peaceoftheocean.com/shesellsseashells</a> 
<a href="http://www.orcawebperformance.com/like-cheese-a-wordpress-plugin/" rel="nofollow ugc">http://www.orcawebperformance.com/like-cheese-a-wordpress-plugin/</a>
*currently this version allows for adding likes to posts 
*3.0 coming soon to allow for gallery image likes, shortcodes

Like Cheese

Like Cheese lets your site visitors 'like' your site images.

ahsanic

Express it is a plugin which adds like/dislike button to your post. Readers can like/dislike your post and it will save the ratings to the database. Likes are saved to your website with the help of PHP cookies. Unfortunately if reader is using incognito browser or has his cookies turned of, plugin will not save reader preference, but it will update the like/dislike in the database.

Express It

Express it adds like/dislike button to your post. It lets your reader like/dislike your post, to let you know how they feel about your post.

Like Cheese vs Express It