This spring more than 400 people in the Philadelphia area participated in the Greater Philadelphia Roundtable, our series of public programs to help shape The Encyclopedia of Greater Philadelphia. The Encyclopedia team and our partners at the Historical Society of Pennsylvania organized this year-long series of programs focusing on major themes in Philadelphia’s history. With funding from the Pennsylvania Humanities Council, each program is preceded by an essay published in The Philadelphia Inquirer and on the web site of WHYY’s Newsworks.org. The June 23 program on the theme “Cradle of Liberty,” held at the National Constitution Center, was taped by C-Span and is now available for viewing online in the C-SPAN Video Library.