I haven't traded anything yet, but am signing up to be a member of a time bank (http://www.timebanks.org/how-it-works.htm
)
Basically, you volunteer your time to do something you're good at (photographing school kids, fixing a deck, driving an old lady to the dentist...) and those hours add up. Later, you can ask other members for an equal amount of time doing those things you aren't so good at (landscaping, carrying heavy stuff when you move, etc). So in principle you can put in some time and help somebody out and then later on, when the need arises, get some help in return. You aren't exactly trading for a specific service, but someone other than the person you did the photos for can give your kids french lessons, for example. I haven't tried yet, but from what I hear the program is pretty successful. And selfishly, maybe a way to get some word-of-mouth advertising. 



