BTW, have you seen the latest spammer trick? We've had a couple of new members recently who have been posting individual replies on the forums (usually something fairly banal like "wow, that's a really interesting post" or whatever), but putting links to some dodgy website as their sig line, instead of in the body of the message. Because the actual messages are inoffensive enough, I haven't actually banned them, I just disable their signatures. The usually go away once they see that their reason for being here has vanished.
“The smart way to keep people passive and obedient is to strictly limit the spectrum of acceptable opinion, but allow very lively debate within that spectrum – even encourage the more critical and dissident views. That gives people the sense that there’s free thinking going on, while all the time the presuppositions of the system are being reinforced by the limits put on the range of the debate.” - Noam Chomsky