Dec 21: App pitching

App makers are pitching at a conference in San Francisco. Joseph Menn, San Francisco technology correspondent, introduces several of those displaying their wares, including Sebastien de Halleux, chief operating officer at Playfish with 'Who has the biggest brain?', Lance Nelson, producer, Social Gaming Network, who shows us 'Skies of glory' and Ben Long, composer at who recently work on the game 'Payload'.