rachel botsman's TED talk on collaborative consumption. i find her a tad optimistic and many of the things she's talking about are only possible in cities - but since the bulk of the world lives in or is moving towards living in cities, it's undoubtedly a good thing.
i haven't participated in any trade schemes, but we do use the local version of craig's list (den blå avis) all the time to find things we need - from old windows to machinery to tools to wood to bunnies. husband even found that house that he tore down for materials on den blå avis. we've developed a habit of looking there first, before buying new.
what do you do to consume collaboratively?