How Local is Local?

Here's another story on defining "local" food. http://www.usatoday.com/money/economy/2008-10-27-local-grown-farms-produce_N.htm
At a program last weekend, we learned that the PA Dept of Agriculture defines local as being produced in Pennsylvania. This was in reference to the PA Preferred program. http://www.agriculture.state.pa.us/papreferred/site/
Some "Locavores" have a tighter definition of local ...... the "100 Mile Diet", for instance. http://www.time.com/time/magazine/article/0,9171,1200783,00.html
How big is your "foodshed"? I try to write about the farms & food that are "local to me". Sometimes, as you can see from my posts, it can be a farmstand, farmers' market, or farm that I pass closeby while traveling. So that's my own version of local!