Here's an interesting experiment in England - a farm is signing up 10,000 subscribers to run their farm, making actual monthly decisions (loosely based on the Facebook game called Farmville):
The farm is on the National Trust’s Wimpole Estate. You’ll be part of a group of 10,000 online Farmers working with farm manager Richard Morris to decide how it should be run. You’ll vote once a month, discuss the issues with other members and explore the world of farming.
The cost 30 British pounds yearly. Could be an interesting step beyond shares in a Community Supported Agriculture operation, but without the time commitments of some model farms where people put in actual work hours.
We'll see how it goes.