On Saturday January 15 Wikipedia will celebrate its 10th anniversary. As Computerworld says, Wikipedia "has become an Internet juggernaut by spreading access to information with a model that lets anyone edit its articles." To celebrate, Wikipedia and its users are planning more than 300 events across six continents and have set up a special webpage called ten.wikipedia.org where event organizers can list information (and yes, there is an event listed for Pittsburgh, on the South Side at the Carson City Saloon).
Wikipedia has also set up a timeline page that lists important events and milestones. Currently there are about 17 million Wikipedia articles, of which about 3.5 million are in English.