gentlesource

This plugin creates a short URL from the blog post permalink and stores it 
in the database. The URL is displayed below the blog post along with a link 
to twitter that passes the short URL on.
You can use all short URL services that offer an API. Here are a few:
<ul>
<li>http://melt.li/</li>
<li>http://lin.io/</li>
<li>http://unrelo.com/</li>
<li>http://bit.ly/</li>
<li>http://u.nu/</li>
<li>http://tinyurl.com/</li>
</ul>

GentleSource Short URL

Automatically shortens the blog post URL.

Ivan Barreda

Shortener Simple creates in an easy way, links with customizable url, with landing page that can be changed and reused.
<ul>
<li>You can change the destination url.</li>
<li>Accounting visits to the link.</li>
<li>Indicates the code with which you want to redirect to the destination URL (301 by default).</li>
</ul>

Shortener Simple

Generador de enlaces cortos personalizables, modificables and reutilizables.

GentleSource Short URL vs Shortener Simple