So I was looking at pictures of the Siegel house in Cleveland (Glenville, to be specific). I came across a few interesting things.
There's evidently yet another documentary about Superman, called Last Son. This one delves into the truth behind the creation of the character. If I'm reading correctly, it's more about the death of Siegel's father than anything else. Looks interesting. Not quite sure how to get my hands on it, though.
Marc Tyler Nobleman, creator of Boys of Steel (a comic book biography about Siegel and Shuster) wrote this little post about the current popularity of Superman's creators. The Last Son guy throws his two cents in.
In an unrelated link, there's this essay on the impact of John Byrne's 1986 variation of the Superman story at newsarama, by tomothy Callahan. He says the legacy of Byrne's changes is the humanization of Superman, and the cumulative stories--continuity, in other words, and character issues instead of just fights.
Here's a lesson plan on how to teach heroism and mythology to middle-schoolers.