Balcony/window garden here. My romaine lettuce and swiss chard have shot up and are harvestable. Mustard greens -look- all right so far, but still tiny. My spinach isn't looking so hot. :/ My herbs are doing insanely well, particularly the various chive and basil plants. My chocolate mint is looking pretty good but the scent isn't as strong as I remember.
To the person talking about gardening on the roof:
http://www.yougrowgirl.com/ Yeah, silly name, but the writer has a successful roof garden. Her books are good starts, too.