"What Bill Gates can't deny is providing the following nugget of perspicacity to the 2004 World Economic Forum. "Two years from now," the father of modern information technology said, "spam will be solved". As anyone with an email account can testify, the avalanche shows no sign of receding."
Spam may not be solved... but in some ways - and for me - it is. I don't think I've seen a single spam message in the two or three years since I've started using gMail, and I am always quite amused when my family talks about how much spam it gets... (Nor do gmail filters mark things I want as spam).