ILM have put together an awesome behind the scenes featurette for The Avengers.
Animating the Turtles in Teenage Mutant Ninja Turtles with Maya
ILM VFX supervisor Pablo Helman talks about the performance capture for Teenage Mutant Ninja Turtles and the animation done in Maya.
Behind the Magic: Marvel's The Avengers - Anatomy of a Shot
ILM go in-depth on one of the most impressive and challenging VFX sequence from The Avengers.
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.