While I agree with girl-wonder.org's message, it's followers have a habit of taking things waaay too seriously. Like when Karen Healey went on a lengthy blog rant accusing Brian Bendis of sexism, because he joked that his letterers weren't allowed to cover a woman's butt with a word balloon if it was drawn by Frank Cho. (Although if you've seen Frank Cho's work, you know that his butts are no joke)
And then there's stuff like this:
If you do not have at least two female characters, and they do not discuss something other than the male characters, your story is sexist.
(not an exact quote, but it's almost verbatim)
Again, I agree with it in spirit. Your story probably SHOULD have those, and every writer should put serious thought into the way they portray things like race and gender. But the notion that every story has to pass a Political Correctness Checklist, while well-intentioned, is ultimately harmful, and leads to a lot of insincerity in writing. Like Ray Bradbury said, there's more than one way to burn a book, and if you find yourself changing a story because of what someone ELSE thinks instead of what YOU think, you've stopped being an artist (or at least a good one).
That said...yeah, comis, and art in general, can be sexist as hell. But look on the bright side: In a few short years we'll have an entire generation of new writers and artists who grew up on Neil Gaiman and others who treated gender in both a fair and honest way.