After so many teasers and a handful of screenshots since it's official announcement, we finally get to see Fallout 3 in action. The first-half of the trailer opens with a deliberately corny informercial, suggesting that everyone get a space at one of the vaults to survive the nuclear holocaust. The second-half shows off the gameplay, which looks promising, all wrapped together by a cheery, olde song for ironic effect. Bethesda's next monster of a RPG is set to ship this Fall.