How to get rid of a really, really annoying member

[Lynne]

You've got his IP, right? So email his ISP with a list of his offenses and see if they are willing to do something - especially bring up the spamming and hacking. Many ISPs do not like that at all.

But, seriously, I used the whole "moderated usergroup" thing for a long time - two years. I just wrote in the welcome message that the first several posts were moderated to prevent spam. People understand this. You can promote them automatically after a week (or whatever) or after so many approved posts.