Virtual Director, or simply vdir, is a very basic ASP.NET MVC application that allows me to provide custom persistent links to my content. Essentially, I can provide a link such as vdir.us/go/jsedlak and it will redirect you to a URI of my choosing. In this case, the link points you to jsedlak.org.
The reason for not using such services is purely personal choice. With vdir, I can control infinitely more about the service. For example, in the future I plan to tie the service into my other websites to generate the vdir urls on demand.