Bill Walsh QB/Offense Manual
It's linked from SmartFootball.com today. I just downloaded it and am reading through it. 66MB, 232 pages of football goodness. It looks like it was scanned in from typewritten/hand-sketched papers so some spots are difficult to read. Well worth it though if you like the minutae of passing offense. FYI you will have to sign up (free) for Scribd.com to download it, though you can view it without signing up.
1985 Stanford University QB Manual - Bill Walsh- 232 pages
You can spend a lot of time and money picking out the perfect floral bouquet for your date ... but you're probably better off checking if you have bad breath and taking the porn out of the glove compartment.
The moral: you gain more by not being stupid, than you do by being smart. Smart gets neutralized by other smart people. Stupid does not.