There's a growing number of barterers out there, www.swap.com boasts nearly four million members. The site makes it easy to connect to local events and local swappers.
Barterquest.com is another very active site that features big ticket items like real estate and planes!
Locally, of course, there's one called Salem Area Buy, Sell, or Trade. It was started by a local business owner, We hear it started out as a 100 member group and now has blossomed to more than 9,000 thousand members.