Call of Duty 4: Modern Warfare is proving itself a juggernaut among 2007's first-person shooters. One of last year's best-selling games, COD 4 performed well on PC, PS3 and Xbox 360. Because, like you, IGN can't get enough Call of Duty, they sat down with Infinity Ward Community Manager Robert Bowling to talk about what went in to developing COD 4. Bowling revealed that there were once vehicle mission in the game and even Humvees in multiplayer. He went on to explain what was coming in the next patch and explained the process for creating multiplayer maps.