I took advantage of the free HBO preview last weekend on DirecTV and recorded the Namath documentary. While I have never liked Broadway Joe, I was quite impressed by this documentary. It contains a decent amount of game footage from his high school and college career plus NFL Films action from his AFL years. For the segment on Super Bowl 3, HBO superimposed original NBC TV audio over much of the NFL Films video. It was also very interesting to see clips from some of his TV commercials, movies, and his short-lived TV series The Joe Namath Show.
If you have access to HBO, I definitely recommend this documentary. HBO will be replaying it many times over the upcoming weeks, so check your program guide.