The
Two Film Introverts podcast
has devoted an episode to Hergé and Tintin, giving a brief outline of the series' history, and then concentrating on the many and various adaptations.
It's well worth a listen, with lots of subject knowledge (and a shout-out for Tintinologist.org!) and some interesting point-of-view - highly recommended!
You may know Paul Bullock (half of the
Two) as an insightful commentator on the life and works of Steven Spielberg, as well as the wider world of film: if not, look for his
From Director Steven Spielberg blog!