The website The Philly Skinny was once a favorite one-stop shop for real estate junkies. It was a database of all the development and construction happening in the city, including status info and theoretical dates. It had a map with the info into one of those easy-to-use interfaces that everyone liked because we've all become web zombies. It was, to put it simply, AWESOME. And then it vanished.
Thankfully, the Philly Skinny has returned (we're grateful to Philaphilia's GroJLart for inspiring Michael Burlando to bring it back), but it's going to be crowd-sourced now so that Burlando doesn't lose his mind. Go forth and visit, and make corrections if you see errors.