The next speaker at this AoIR 2013 panel is T.L. Taylor, focussing here on spectatorship in gaming. The mix of playing and watching has always been central to gaming as a social activity, but game studies has always privileged the hands on the controller; spectatorship has traditionally also relied on physical co-presence (e.g. at gaming championships).
But now there are sites like Twitch, which enable gamers to make their private play public as a livestream, and even to make money in doing so, as a spinoff from JustIn.tv. The site currently has some 600 unique broadcasters per month, with some 45 million viewers per month and around 1.5 hours of play watched per day (hope I have those stats right). On Twitch, viewers can choose by game title, player, or channel, and players can trigger occasional commercial breaks in order to generate revenue.