Popgun Chao$! has a great interview with Mark Waid about Captain Marvel. Specifically, what makes him attractive, what differentiates him from other superheroes, why he's such a difficult character to build a series around, and why he doesn't have to be. To no surprise, Waid absolutely nails it.
He's also inspired me to check out not only Chip Kidd's new Shazam! book
, but also DC's Shazam! Archives.
