Robert McGinley Myers did a proper job of writing up Dispatch. There is so much to like about that app. However, I don't use it as much as I used to because Sanebox already manages so much email for me. Another up-and-comer in the iOS mail racket is Boxer, that includes a lot of similar gesture based mail management tools (though not as much third-party app support). However, Boxer works on all your folders, not just your inbox.