Anyone wishing to take a more active role in deterring spammers should find the Kill Spammers forum worth a visit. There are several scripts available for either leeching bandwidth from spamvertised sites (increasing hosting costs) or placing fake orders/leads (more effective with "pharmaceutical" or "mortgage refinancing" sites).
The order scripts are site-specific, but if you have a spam problem, there's a good chance that there will be one that allows you to give a site you recognise the business it so richly deserves...