Originally posted by catnapper
The administrators could contact the offending person and issue a warning... then the person could ignore the warning or shape up. If they ignored it and continued for, oh say, another 20 posts then they'd be kicked out. But then the problem is they could sign up again as someone else and start all over.
There are ways to ensure the same person doesn't log back in or register but I won't post them here in case the nasty person is reading.

I have also seen some great hacks (additional code to add to a forum) too.

One hack allowed the banned user to do whatever and he/she thought they had a normal account but the twist was that nobody else saw them or their posts...ha ha