On Phil's Stock World I found this article on Alt-Market.com a new site by the founder of Neithercorp.us
The goal of Alt-Market is to facilitate barter networking and the exchange of knowledge and ideas for thriving in a faltering monetary environment. Alt-Market’s developers would like to de-centralize and de-globalize our system of commerce and help us re-localize our economy, in order to insulate cities and states from a possible (and ever more likely) collapse of the dollar.
More for the people who want to do something...
There is also the locavore movement. Originally set up to "save the planet" by eliminating transportation of food, it's real use is in the barter and trade of locally grown fruits and veg. Another way to keep local and make contacts with growers of goods that will be needed at TEOTWAWKI. Or just to keep your family supplied with fresh veg for the growing season.