A hipster friend of mine lives across the street from this project in Brooklyn and is part of their CSA and is always raving about it so I figured I'd share. Plus I think time-lapse of plants growing is so awesome to watch.
Video
This 7-month time lapse documenting the first full growing season at the Brooklyn Grange's farm in the Brooklyn Navy Yard. Not exactly permaculture plantings but it goes to show what we can do with all that space on our rooftops in urban areas.
http://brooklyngrangefarm.com/