Planning a day off with your buddies is never as easy as it seems, what with the questionable parking situations, and the losing your buddy only to find him belting out "Twist & Shout" on a parade float, before marrying the Sex and the City chick and falling off the Earth. Ending all that, CommonSpace.
Devised and coded by a collection of four Phila-centric companies, just-into-beta Space's a Gmap-based site that'll let you and up to five friends (good luck with that) coordinate itineraries, waypoints, and travel arrangements for walking, driving, and public transit in a shared area, but not a shared Area 51, because that only has two guns. To get started, plug in starting points and a comfortable walking/biking/transit distance (which can be adjusted later), and Space'll highlight an area that's good for everyone to meet up in, plus throw down overlays plotting & giving detailed info on food/shopping/arts/etc from review sites like Uwishunu and Yelp! and tourist-friendly Philly Fun Guide, which unsurprisingly, isn't nearly as awesome as Philly Fun Dip Guide, but is more likely to leave your tongue its natural color. Once you've picked your locales, you can select the order in which you want to hit them before printing/sharing your itinerary, then compare with everyone's routes to plot out your friends' schedules, which's tons easier now that Joey got canceled.
They're also offering video tours and instructionals that'll get you oriented to the site -- great for anyone who asked for a car, but got a computer.