CSA is Community Supported Agriculture. Basically it's a subscription service to a local farm. I get 2 boxes delivered every 2 weeks, one box of veg, one of fruit. I just signed up last month. It's more produce than we were eating, but not so much that it's all going to go bad, it just makes me more aware that I need to eat more veggies.
For mine, everything is in season and mostly local (some less local, but all grown in the US), all of it's organic. This week's veggie box was chard, kale, collards, napa cabbage, butternut squash, lettuce, leeks and potatoes. The last one also had broccoli and broccoli rabe... it's just a matter of what's ready to be picked this week. The fruit box right now is apples, pears and citrus with a couple persimmons or pomegranates thrown in.
It's a great way to support local agriculture. Since it's a subscription service, they can plan ahead for how much to plant, and they can count on the income from it. From what I've seen, in most Northern parts of the country CSA boxes are spring/summer/fall only, but here in CA it's year-round.
And right now, since I can't keep up with the fruit, apple butter is on my horizon.