Patti Moreno is known as the Garden Girl.  She's got a pretty rad site, and some great informational videos, including this on, on sustainable urban gardening.
[youtube=http://www.youtube.com/watch?v=rmmBXqHpdV8&eurl=http%3A%2F%2Fwww.gardengirltv.com%2F&feature=player_embedded]
and check out her how-to on drip irrigation here: http://www.dripworksusa.com/video/videoggtab.php