CSA is a Community Supported Agriculture, and is a movement around the U.S. whereby local farmers distribute their crops directly to consumers. You find a CSA, pay for a share, and get a weekly or bi-weekly delivery of fresh, local, and usually organic vegetables.
Here's a link about it: Local Harvest / Farmers Markets / Family Farms / CSA / Organic Food
We are going to start participating this fall, and will also get fresh duck/chicken eggs as part of our share. I'm super excited, my friends have really enjoyed their share.