This weekend will see another "namespace landgrab" on the internet as Facebook allows users to register "usernames" to give a short URL to their profile.
At the moment Facebook profile URLs looks like this www.facebook.com/profile.php?id=1243734634 or this http://en-gb.facebook.com/people/Tim-Hatton/575053139. In common with other social networking sites such as Linked In and Twitter, Facebook now want to make the URLs more "friendly" so you can register www.facebook.com/johnsmith or whatever.