I used a broadfork to dig up a community garden plot in the fall a few years ago. A little work, but it broke up the clay loam fairly well. One other benefit was that the plot was infested with bindweed - while a tiller just chopped up the roots, all of which would then sprout later, the broadfork pulled up the roots whole and I was able to pull them out of the plot - while I didn't get rid of all of it, it really cut down on it. Plus, unlike my little tiller, it didn't throw the dirt around and out of my border.
