The St. Paul Growers Association was founded in 1852 and they run the St. Paul Farmers Market. Up until 1998, all food sold at the Market had to be produced within a 50-mile radius. The changed the rule in 1998 to apply only to produce, and other products (like meat, plant starters, honey, fish, etc) have to come from either Minnesota or Wisconsin.

http:/www.stpaulfarmersmarket.com/
http://www.ams.usda.gov/farmersmarkets/Articles/StPaulfmarticle.htm

Good site. I don't know any US or Canadian zip codes so can't test it. I wonder how many farmers are associated with this site. That is to say, how many food choices would pop up if I lived in some small town in, say, Kentucky or Montana. Nevertheless, this site is a good link-up between consumers and farmers (if there are many farmers associated). Food delivery still remains a tricky issue.

Here is where I found a local CSA from. It lets you search by zip code and type of establishment (like a Co-op). I think it just covers the United States though.

http://www.localharvest.org/

With a CSA, I am getting most of the items I need as a vegetarian, I have to purchase my own nuts and hemp through the mail unfortunately, but if you buy in bulk, there is at least some reduction in packing materials and trips made by the delivery van.

For the UK, use this site below to find markets and CSA's in your area.
http://www.cuco.org.uk/index.php?page=3

I actually found more info on local foods at Sustainable Table than I did at the CSA site. I've also found word-of-mouth to be a great source; that's how I found a local organic farmer just a couple of miles from home.

As a small part-time grower, just wanted to give a second on the eatwellguide.org and localharvest.org, both valuable resources. I posted my farm on localharvest.org. Remember, not all local producers are online (gasp) so I'll second the word-of-mouth and as I've done in previous comments section, I'll plug just simply going to your nearest farmers markets. Farmers markets are increasing in numbers and frequency and I guarantee there are local producers there who would like to meet you. Just about every single producer at the 2 markets I go to are easily within 100 miles. The 2 markets I go to are 5 and 12 miles away from my small farm respectively. While at the market, be sure to ask the producer how everything was grown and where etc. (any producer who takes offense to such questions you maybe don't want to buy from). Plus, if you don't see something at the market you want to buy, ask the producers there if they know of a local option for you.

There is simply no need to re-invent the wheel. LocalHarvest.org started up several years ago, and currently has over 7000 members (farmers, ranchers, restaurateurs, etc.) in a search-by-zipcode database that places your results right on a map. This is my #1, most-referred website in my eighteen year history online.

You can read more about Guillermo here: he is a visionary, a genius, and one of the kindest, funniest people I have ever known. Recently, he was badly injured in a hit-and-run accident, and every farmer I know was stricken. Many say things like, "He's done more for our farm than anyone else."

Just my .02 from an Eat Local Challenge participant and author.

Signed,
Farm Lover and Farmers Market Devotee

Considering what "online" was even 10 years ago, I hardly think there was much of use out there 18 years ago. Don't know when AOL began, but it was, perhaps, the first popularly accesible internet-use-enabler in the US and it was just a baby even 12 years ago.

I do enjoy localharvest.org, though (and my internet, too).