Sharing generated short URLs is very common these days. For example if you want to send a link to a document hosted in your SharePoint 2010/2007 document library it would be something like
So you would probably include something like above in your email. Now instead of doing this, it would be aesthetically pleasing to generate a short URL like http://t.co/Lvj9RMyf. If you are interested in doing so, following are some solutions that might be of interest to you.