On Server Fault we have noticed a lot of people naming their accounts Server fault, Moderator, or new today Deleted account. This could lead to some confusion, and I would like to request they be blocked. Also though I haven't seen it, I wonder if someone could sign up with an expletive or non-appropriate username?
If you think a particular user name is offensive or confusing, just flag one of the user's posts with a message to the moderator.
They have all the tools required to deal with such behavior.
The trouble with a black list, is that people can constantly figure ways around it.
Fu*k and so on....