I stumbled upon it. Basically it is a brief overview of the passing game from the pre-superbowl era to the time when it was published (2008 I believe) http://www.coldhardfootballfacts.co...t-filled_history_of_the_NFL_passing_game.html
One of my favorites -- http://www.smithsonianmag.com/histo...ory-of-Footballs-Forward-Pass.html?c=y&page=2