It bothers me that they won't let you actually delete your account.
http://www.facebook.com/home.php#/group.php?gid=16929680703&...
It works. They deactivate your account for 2 weeks and then permanently delete it. Worked for me.
I've got friends who've mailed to support@facebook.com and gotten their accounts removed following. I'd be interested to hear if other people have had similar encounters.