The company behind this helmet, Volpin Props (http://volpinprops.blogspot.com/), produces absolutely amazing work, especially considering it's all one guy. Some of his other projects include:
Big Daddy (Bioshock) http://www.flickr.com/photos/14455307@N07/sets/7215762286087...
Portal Gun http://www.flickr.com/photos/14455307@N07/sets/7215761888999...
Force-a-Nature (Team Fortress 2) http://www.flickr.com/photos/14455307@N07/sets/7215762302451...