Yeah, the storyline falls like this for the Marvel movies I believe...
Iron Man > The Incredible Hulk > Iron Man 2 > Thor > Captain America: The First Avenger > The Avengers > Iron Man 3* > Thor: The Dark World*
Then there's supposed to be another Captain Anerica, another Hulk, and another Avengers movie; unsure on the ordering though. :9:
* denotes unreleased also.