AppFabric appears more like Messages/Queue solution.
We are building APIs to be consumed mostly by iPad/Android/WP7.
Messages/Queues don;t make sense in that scenario(data to be returned from API is expected to be instataneous).
Also I am trying to make sense of putting MVC 3 solution used to build APIs, hows that going to be hosted on AF.
AppFabric is so confusing :-(