Liz Strauss Comment Counter is a highly configurable badge (very similar to the Feedburner one, except it’s more configurable) to show off the number of comments your blog has.
This plugin was made in celebration of <a href="http://www.successful-blog.com/" rel="nofollow ugc">Liz Strauss</a> dedication to blog community building so you, too, can show the world how social your blog is.
For a more detailed documentation and screenshots of the interface, please visit its official page: <a href="http://planetozh.com/blog/my-projects/liz-strauss-comment-count-badge-widget-wordpress/" title="Liz Comment Counter by Ozh" rel="nofollow ugc">Liz Comment Counter</a>
Tip: To keep track of this plugin’s evolution and features, you are advised to subscribe to the <a href="http://planetozh.com/exit/feed" rel="nofollow ugc">author’s feed</a>
Ho, and if you like this plugin, please rate it 5 stars! 🙂 ——————–>

Liz Comment Counter by Ozh

A highly configurable badge to show off the number of comments your blog has.

Boone Gorges

<a href="http://yourls.org/" title="Your Own URL Shortener" rel="nofollow ugc">YOURLS</a> is a free URL shortener service you can run on your webhost to have your own personal Bitly.
This plugin is a bridge between <a href="http://yourls.org/" title="Your Own URL Shortener" rel="nofollow ugc">YOURLS</a> and your blog: when you’ll submit a new post or page, your blog will tap into YOURLS to generate a short URL for it.
This plugin also features BuddyPress support. Short URLs can be generated automatically for each member and each group, and are customizable if permitted by the BuddyPress administrator.
Requires PHP 5.
Note: this plugin should still work but is no longer maintained. See http://yourls.org/#More#wordpress

YOURLS: WordPress to Twitter

Use YOURLS (a free GPL URL shortener service) to create short URLs of your posts, or for your BuddyPress groups and users

Liz Comment Counter by Ozh vs YOURLS: WordPress to Twitter