I'm writing a new superhero script now and have two that I have completed:
Superhero Support Group: http://freedrama.net/supers.html A play for six actors.
Protecto (Kid Hero): http://www.freedrama.net/protecto.html A monologue.
Eventually I hope to have enough scripts on this topic for a longer themed play.
My wife does a lot of awesome superhero art. Her Rogue picture from X-Men is very popular but she does a great villain (Harley Quinn):