Official Bitly plugin for WordPress. Replaces shared links with Bitly short URLs. Also, gives you the option of placing a Bitly widget on your site.
With our new WordPress plug-in you can automatically create Bitly links for new posts and have those short links pushed to your pre-existing social sharing tools. Additionally, you can show a Bitly sidebar widget that displays your most popular or most recent bitmarks OR displays the top results from the bitly universe for a search term of your choosing.
This plugin uses the Bitly API (http://dev.bitly.com) all links are stored in WordPress and with Bitly.