Richard Florida, well-known for introducing the term “creative class,” has recently released an assessment of the class divide distinguishing the Philadelphia area. Part of a larger series on U.S. cities, the report draws from the U.S. Census American Community Survey to designate areas across the region as part of one of three classes: creative, service, and working. The study is of particular interest to the editors of the encyclopedia because Florida provides one strategy for understanding the region just as we are about to undertake the challenge of assigning essays that will help us define what has constituted “greater Philadelphia” over time. We would be interested in how those who have been following our work react to Florida’s essay. It has already provoked a good deal of commentary on-line, and we welcome your own reactions.