http://www.articlesbase.com/art-and-entertainment-articles/the-history-of-superman-1094724.html
that details the progression of the Superman character from his
inception in 1932 through today. I knew most of the stuff already as
I'm a major Superman fan but there are a few interesting tidbits that
I didn't realize like the fact that there were four audition shows
made before they finally got the Superman radio show on the air.
Enjoy!