michael from the ideas-are-a-dime-a-dozen dept.
Evan Harris writes "I've just published a paper on a new and unique spam blocking method called "Greylisting". The best thing about it other than achieving better than 97% effectiveness in blocking spam, is that it practically eliminates the main problem of other solutions: the false-positive. There's even source code for an example implementation written as a perl filter for sendmail, along with instructions for installing, so you can get up and running quickly."
The best book on programming for the layman is "Alice in Wonderland";
but that's because it's the best book on anything for the layman.