Logos Bible Software just launched a new website called ref.ly (think bit.ly). It allows you to share Bible verses as links via Twitter and other places where you have a limited number of characters and want to keep the URL as short as possible.
Enter a Bible reference, and ref.ly will instantly generate a short URL linking to the passage at Bible.Logos.com. Since ref.ly uses Bible references to create the URL structure rather than a random bunch of characters like most URL shorteners, you can create the short URLs yourself without having to visit the site every time.