This was almost as much of a shock as Robin Williams, and for me personally, as much of a punch in the gut.
I summed up his career pretty well in his Halloween entry two years ago.
I also highly recommend the book "Wes Craven: The Man And His Nightmares".
It's cobbled together from research, and Fangoria interviews, and does a really thorough job of telling his life story.
Me, I feel like watching Nightmares 1 & 7, and "The People Under The Stairs".