Movie posters have been an integral part of movie promotion since the dawn of the age of "moving pictures." Originally, posters consisted of primarily placards placed outside of theaters that listed the features shown within, but by the early 1900s they began to feature full color illustrations, borrowing much of the design inspiration from circus posters and popular advertisements.
Today, we can't imagine a movie being released without a movie poster and comic book and other genre movies tend to release multiple posters featuring different scenes from the movie or focusing on individual characters from the movie. Thanks to the popularity of the internet as a major marketing tool, the advent of "motion posters" has started to take hold.
I've spent some time tracking down and posting over 400 comic book and related genre movie posters. Click the image below to check out the gallery. You'll find some blasts from the past and some obscure foreign and low print run posters. It's a work in progress, so if you don't see your favorite CBM represented let me know and I'll work on finding some posters for it.