Facebook users can now register at
http://facebook/username a custom URL for their own profile. Saying http://facebook.com/albertcuesta over the phone it's obviously easier than http://www.facebook.com/home.php#/profile.php?id=645002665. So far, so good. However, the new system is leaving mobile Facebook users out in the cold: checking http://m.facebook.com/albertcuesta from a cell phone (or any other browser, actually) gets an error page. This is not exactly good policy given the growth of social network mobile usage. Hopefully the FB guys will eventually sort it out, but it will always be an afterthought.
Anyway, vanity URLs are being assigned on a 'first come, first served' basis and no approval requirements, so you better rush for yours.