Valve has announced the winner of its zombie photo contest that ties into the $10 million marketing campaign for Left 4 Dead which is shipping to retailers worldwide this week. The contest challenged gamers to take a creative photograph of themselves in front of one of the outdoor media placements in London, New York, Boston, Chicago, Los Angeles, Seattle and the San Francisco Bay Area. The top 25 entrants won a free copy of Left 4 Dead, and the overall winner will receive a new gaming PC from AMD.