long version by Godwin himself:
http://www.wired.com/wired/archive/2.10 ... if_pr.html
Short Jargon file version:
http://www.catb.org/~esr/jargon/html/G/Godwins-Law.html
Quote for those who abhor clicking on external links:
Godwin wrote:As an online discussion grows longer, the probability of a comparison involving Nazis or Hitler approaches one.
the wired article is very good - Godwin developed the law in order to actually
counter the trend described in the law - when a discussion looked like it was about to degenerate into nazi comparitives, then someone would quote the law and the dignity of all involved would be somewhat salvaged.
the probable reason why my attempt at making a similar law for this site won't work is because most people enjoy talking about women, mazola or both simultaneously...etc.
perhaps I spend too much time thinking about stuff like this..