From cnn.com: http://www.cnn.com/2004/TECH/internet/03/05/spam.charge.ap/index.html I know this is old, and this only seems to be a follow up article, but I haven't seen the discussion on NMA yet. I think it is a great idea. As long as free email still exists and is still supported. The idea of paying for email with a small amount of computer time (for solving say extremely high prime numbers) I think is the best idea of the bunch. It still stays free, and keeps spam down. Funny that there is such a large discussion about spam. Is it really that annoying to warrant solutions involving paying for email? Seriously? I realize the irony that further discussion adds to the spam factor already prevalent on this internet we all share.