llywrch points out this interesting story at Art & Farces in which a "guy fights spammers by occasionally sending an email telling the spammer to leave him alone or he'll bill for time & services. Some take him off their mailing list, some pay the bill, but most don't respond . . . except one guy who was so incensed at receiving this invoice he had his lawyers send a threatening note. Makes it easier for Fraase to collect on his invoice."