More info.

Books
There are few very good books for the novice fan. However, I've identified three really good ones.

A Guide to American Football by Ken Thomas ..more

Play the Game American, Football by Colin Nelson ..more

The Illustrated NFL Playbook ..more

Each of these books is a good introduction to the game.

Follow the links for a short review I've written for each of them.

Good links

The official NFL site

CBS Sports NFL coverage

NFLUK - the NFL's UK arm