If, like me, you dream of strangling spammers wit your bare hands, here's some info about the ennemy.
Montreal based Vircom is on the forefront of the Spam War with their award winning Modus spam filter. I have been personnaly using their filter so I can testify to its efficiency. It filters over 90% of junk mail and blocks very few legitimate e-mails.
They wrote a very interresting white paper: Why Spammers Spam that will give you an insight into the spammers' life and motivation.
To download the document, go to this page