Wikimedia Commons is a Wikimedia Foundation website that was launched in September 2004 to provide a central repository for free photographs, diagrams, maps, videos, animations, music, sounds, spoken texts, and other free media. It is a multilingual project with contributors speaking dozens of languages, that serves as a central repository for all Wikimedia projects.
The project is growing rapidly. In October 2007, it reached two million multimedia files, less than a year after reaching one million. Wikimedia Commons received an honorary mention for Digital Community at the 2005 Prix Ars Electronica awards in May 2005.
Source : WikimediaFoundation.org