Marvel Comics into Movies

There have been an incredible number of classic comics being turned into movies.
Comics such as The Green Lantern, Thor, Iron Man, Captain America, and most recently the Avengers.
There's also the classic Batman, Superman, or Spiderman.
I would be greatly surprised though if anyone had looked at the actual comics before seeing the movies.
They are each unique and truly phenomenal.

Above is the trailer to the latest comic turned to movie, The Avengers.