A couple of short videos
History of Unitarian Universalism
http://www.uua.org/beliefs/history
Unitarian Universalist Origins: Our Historic Faith
http://www.uua.org/beliefs/history/our-historic-faith
DRE Sara Lewis offers a brief history of Unitarian Universalism at the Olympia Unitarian Universalist Congregation (36 minutes)
And a set of Power Point presentations on UU history