I like Vic's point of showing them in chronological order, but I would show Phase 1 (Iron Man, Hulk, Iron Man 2, Thor, Captain America, The Avengers) in production order, and what follows in chronological order. We are given a quick history of Howard Stark in Iron Man 1 & 2 - He basically shows up with no needed explanation in Captain America, and is nice call back to the IM movies.