Billy Penn: Philadelphia news from a project supported by public broadcaster WHYY. I find this by far one of the best aggregators of Philadelphia news and opinion, produced with wit and skeptical panache, a truly Philadelphia characteristic.
Elfreth’s Alley: Life along one of America’s oldest residential streets. A museum, tours, and more.
Encyclopedia of Greater Philadelphia: Billing itself as “the most comprehensive, authoritative reference source ever created for the Philadelphia region,” this project from the Mid-Atlantic Regional Center for the Humanities (MARCH) at Rutgers-Camden is not comprehensive quite yet (what, nothing on the history of the city’s newspapers?), but it’s getting there, and there’s plenty to explore in the meantime.
Hidden City Philadelphia: The inside story on some of Philadelphia’s most interesting places, and a continuing call to preserve them. The organization also offers tours and a nice selection of merch for holiday and birthday giving.