ILM have put together an awesome behind the scenes featurette for The Avengers.
Behind the Magic: The Visual Effects of "Pacific Rim"
Industrial Light & Magic have released a VFX breakdown of their superb work done for Pacific Rim.
The Avengers: Age of Ultron - Teaser
Marvel have released the Comic-Con teaser for The Avengers: Age of Ultron.
The Avengers - Visiting the Set
Quint from Ain't it Cool News has spent two days on the set of The Avengers, and has an editorial about it.