The Official NFL Rulebook
Link
thenewstribune.com
After spending a while trying to find the official rules governing certain odd little situations, and being really frustrated by the "NFL 101" scope of the NFL.com Rulebook page, I finally came across this PDF of the 2006 Official Playing Rules of the National Football League. Alternatively, you can purchase a copy of Roger Goodell's latest thriller on Amazon if you want something a little more recent.
