My favorite is probably Championship Football from Dana X. Bible from 1947. It's amazing how much the game has changed but the book still has some great ideas. I've also enjoyed Tony Dungy's and Brian Belichick's books. Any thing else I should be on the look out for?
re: What's the best sports book you've read?(Posted by hashtag on 12/10/12 at 9:57 pm to Elleshoe)
There are several great golf books.
The Greatest Game Ever Played, The Match, and Grandslam; all by Mark Frost are fantastic. John Feinstein has written a ton of sports books spanning several sports that are good. The Caddie Who Knew Ben Hogan, A Good Walk Spoiled, and Open are other favorites of mine.