In case you've missed it, check out the post-credits scene from The Avengers, starring a new threat for the Marvel universe.
VFX Roll Call for The Avengers
This immense article about the VFX of The Avengers makes for a great read and gives great insight into the making of the film.
Guardians of the Galaxy - Making of VFX
fxguide have posted a massive article on the VFX of Guardians of the Galaxy.
X-Men: Days of Future Past - Clips
Here are two more clips from the new X-Men: Days of Future Past film.