Publishers, get the Like Button for Twitter here! Let your visitors promote your content on Twitter and on Truelike.com!
The JotLinks Like Button adds a 'Like' button to your WordPress blog posts.
"I Blank This" is an "I Like This" button, except you can replace the text with anything you want.
MiiPlus allows you to add plus buttons to your website.
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.
Integrate social networks into your site, making it more personal and social. As a bonus, you get more insight in who visits your site.