Wow! Just WOW! From the Superman Homepage comes this amazing infographic. Steve Younis, in collaboration with the Superman Homepage staff members compiled this incredible collection of Superman's "S" shields, as they have changed and evolved (devolved?) from Superman's first appearance to present day.
The shields are drawn from a variety of sources. Quoting Steve from the above linked site "...we felt it was time the Superman Homepage stepped in to create our own detailed chart, truly showing how Superman's "S" Shield has evolved over the past 75 years, using Superman's regular comic books, original graphic novels, Elseworlds, and other publications, as well as cartoons, TV shows, animated movies, films and more."
Kudos to you folks! Outstanding effort. My image below is much reduced. Very large, high quality original at the Superman Homepage. Go check it out!