"It's Elementary" is a really cute PBS special looking at different schools that have tried queer inclusive curriculums (curricula? curriculi? :P).
My fave part is when they show one guy in like a first grade class saying "and the next famous gay person we're talking about wrote the music for the Lion King. Anyone know? Elton John" and this little boy goes "GASP! Elton John is GAAAAY?" like not judgy but just so shocked. I lawled. The overall conclusion is that kids can handle it, and no one seems to raise any issues (IN the classroom) till you get to like 7th and 8th grade; you can see the part where children start to internalize what they're hearing at home.