Make this your starting point to learn about all things UU. The UUA is the central organization for 1000+ member congregations throughout the world. Its mission is "to equip congregations for health and vitality, to support and train lay and professional leaders, and to advance Unitarian Universalist values in the world."
Harvard University developed a strong connection to the Unitarian movement in America beginning in the early nineteenth century. These ties are reflected in the richness of Unitarian Universalist resources across the Harvard Library.
The Meadville Lombard Theological School is a Unitarian Universalist seminary in Chicago. Their online library page provides a variety of resources and collections to help you deepen your understanding of Unitarian Universalism.
UUHS offers a veritable plethora of Unitarian Universalist jokes and memes, some of which are gathered at their website. The bulk of the action happens in their Facebook group.
Well-Known Unitarian Universalists
John Quincy Adams Louisa May Alcott Susan B. Anthony Alexander Graham Bell Charles Dickens Ralph Waldo Emerson Millard Fillmore Oliver Wendell Holmes Julia Ward Howe Henry Wadsworth Longfellow Paul Newman Beatrix Potter Pete Seeger William Howard Taft Henry David Thoreau Kurt Vonnegut Frank Lloyd Wright Whitney Young, Jr.