Another one* I can recommend is "The Other One: The Long Strange Trip of Bob Weir"
http://www.netflix.com/watch/80011852 *See what I did there?
Though many might be turned off due to their lack of interest in the Grateful Dead, it actually touches on a lot of things with Bob speaking quite frankly about not just music and the band, but also (among other things) drugs, groupies, fans, fame, Jerry's problems, why he doesn't currently drive the way legendary beatnik (and former roommate) Neal Cassady taught him and how a flock of bats once saved the band (and no it wasn't a hallucination).
He is lucid and candid and I suspect that some might really enjoy it even if Dead music isn't for them.