Facebook usernames enabled me to create http://www.facebook.com/eileenonline
instead of http://www.facebook.com/home.php?sk=lf#!/pages/Eileen-Ludwig-Photography-Multimedia-Digital-Art/114000268638867
For your facebook profile you can do it: http://www.facebook.com/username/ BUT once you set it, it cannot be changed. Some names are already gone.
Adding pages to your profile for your hobby or business or art is easy http://www.facebook.com/help/?page=903 Get 25 fans of your page by having them LIKE the page to be eligible to pick a usernames http://www.facebook.com/notes.php?id=10381469571
You can decide on a badge for your page and use it elsewhere to point people back to your facebook page http://www.facebook.com/facebook-widgets/index.php