Have you heard about Library of the Early Mind? It's a documentary film about children’s literature directed by Edward J. Delaney and produced by Edward J. Delaney and Steven Withrow. I first heard about it last year, when it premiered in NYC and Boston, and I’ve been looking forward to seeing it ever since.
More information can be found at their website, including dates and locations for future screenings. It will be shown here in Philadelphia at the Rosenbach Museum on March 12 (and it's already on my calendar!)
New screening dates are added frequently, so keep an eye for it in your area.