The Chron's got pretty extensive coverage on The Eat Local Challenge. As I mentioned, we're going to be giving it a whirl starting tomorrow.
Already I can see some of the difficulties. Sticking to the budget is going to be the big one. The other is that there isn't really salt, pepper, flour, or a zillion other things I cook with all the time within a hundred miles of my kitchen. I was talking with a friend of mine, and he asked about restaurants. He pointed out that even restaurants that emphasize local products get a lot of stuff from far-away lands.
The way I look at it, this isn't an exercise in limitation. I'm taking it on as an opportunity to enjoy exploring the things around me, rather than fretting over where I'm going to find locally-produced cornmeal. It's rather telling that the most successful of the Chron's guinea-pigs were a retired couple who've been doing this for years, and restaurant-owners, although the less-connected, more time-constricted city-slicker made a good go. I don't have the time, or the experience required to spend my week hunting down every last ingredient. And that's fine for me.
As I mentioned to my friend, I'll be happy with an organic scone or loaf of bread from a locally-owned bakery. If the flour wasn't made in a shed in the back, it's not going to ruin my day. I'm approaching this whole thing as realistically as possible. We can't eat entirely locally. But that doesn't make trying to eat closer to home not worth working on.
Besides, anything that gives me an excuse to eat awesome cheese and drink good hooch can't be bad, right?