Oh I disagree very much. The Walking Dead is top notch TV - the barn scene in season 2 was an immense emotional payoff for a season that plodded a bit, but Seasons 1 and 3 have been strong. As for recent movies, 28 Days/Weeks Later were very good, and Rec/Rec 2 were outstanding. Zombieland and Shawn of the Dead were pretty funny. Dead Snow has the Nazi Zombie genre pretty well covered, too, though I'll leave it others to point out inaccuracies as to the Zombie Nazi kit (the MG42 looked pretty good to me!).
World War Z is the pinnacle of Zombie literature (which is not to say that the Walking Dead graphic novels don't have their moments). I'm hopeful that the upcoming movie is worthy of the book.
OK, so the zombie media market is 'saturated', sure. But not played out, IMHO, especially since the original Romero work were so campy and subject to improvement.