OK, here's a light-hearted way to discourage spammers. Hit them with this:
This might help to reduce flaming, since people could just click this and leave it at that.
Possible candidate for addition to the 'clickable smilies' list?
If it doesn't get added, the url is http://homepage.ntlworld.com/stacymouse/spamfrown.gif for those of you who like it.