With its historical roots in the Jewish and Christian traditions, Unitarian Universalism is a liberal religion -- that is, a religion that keeps an open mind to the religious questions people have struggled with in all times and places. We believe that personal experience, conscience and reason should be the final authorities in religion, and that in the end religious authority lies not in a book or person or institution, but in ourselves. We are a "non-creedal" religion: we do not ask anyone to subscribe to a creed.From the affiliated Unitarian Universalist Association website
Our congregations are self-governing. Authority and responsibility are vested in the membership of the congregation. Each Unitarian Universalist congregation is involved in many kinds of programs. Worship is held regularly, the insights of the past and the present are shared with those who will create the future, service to the community is undertaken, and friendships are made. A visitor to a UU congregation will very likely find events and activities such as church school, day-care centers, lectures and forums, support groups, poetry festivals, family events, adult education classes and study groups.
Edit: The Wikipedia Article on Unitarian Universalism might also be of interest.