When post a link to a web site and the link stretches across your page over into your sidebar you can shorten that link using the TinyUrl . If you are using the Firefox browser it actually has an add-on toolbar for creating the shorten URL as you go. For Internet Explorer you can bookmark it or drag the link to your links bar as a shortcut to the site.
https://addons.mozilla.org/en-US/firefox/addon/911TinyUrl Tool Bar
TinyUrl – IE browser