I'm in Philly, too! I live in Center City - I've just finally taken the leap into car-free living by getting rid of my car. So my bike is my chief transportation mode. Although with the nasty weather, lately, I've had to break down and take the bus to work. But usually I ride to/from work (only about 2.5 miles to U Penn).
I can't wait til springtime! I wanna spend some time exploring the trails along the Schuylkil and up Forbidden Drive.
I have a single-speed Peugeot I use for daily commuting and a nicer, newer Fuji hybrid for more serious rides. None of my friends are into biking, though.... I need some bike buddies that would like to explore the area with me.... Anybody game?