you probably know of This I Believe, a "public dialogue on belief".  Listen to this one, by Mary Seton Corboy of Greensgrow, a pioneer in urban gardening in Philadelphia.

http://www.whyy.org/podcast/thisibelieve/tib20090213.mp3
and while we're talking about pennsylvania...
if any of you out there in the blogosphere have contact with some folks at Landslide Farm in Pittsburgh--we're trying to get in touch with them!
please email [email protected]