Marvel's The Avengers official website has also gotten an update featuring new character bios and downloads (mostly variations on themes and images we've already seen). You can check out some of the wallpapers here. To visit the site:
Marvel's The Avengers was released May 4th, 2012 and stars Robert Downey Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner, Tom Hiddleston, Clark Gregg. The film is directed by Joss Whedon.