Editors' Note: The Download Now link will prompt a local download of the Google Chrome extension. To install the extension directly, open the file using your Chrome browser.
URLShortener is an extension for Google Chrome / Chromium which allows you to shorten the current website URL and makes it easy to post to twitter and also copy to clipboard.
Go to the options page you can choose which URL shortener services you would like to use, and BitLy needs you user name and API Key in order to work properly. It has an option to retrieve the current website's title and copy along with the shortened URL so it becomes easy to post to twitter without having to write anything.