Homestead Axe
As urban gardeners are evicted in Los Angeles, Rad Geek makes the libertarian case for the squatters.
On a related note, I recommend Sarah Ferguson's history of community gardens in New York.
Update: More commentary here. Some ugly allegations about the L.A. farm's leaders are here. A reply to the allegations is here. Another Sarah Ferguson article on New York's gardens is here. Hernando De Soto's classic Reason piece on the squatters who built America is here.