This document discusses the origins and development of open government and open data initiatives. It traces the concept back to letters by Thomas Jefferson on ideas and information sharing. It then outlines key developments like the Freedom of Information Act and open source software movements that promoted transparency and open access. The document discusses pillars of Government 2.0 like collaboration and open data. It examines Obama's memorandum on open government and the Open Government Directive. Finally, it provides examples of open government projects and initiatives around the world.