Peer-to-Peer Collaboration Principles - http://p2pfoundation.net/Core_Peer-2-Peer_Collaboration_Principles
1. SHAREABLE.NET - http://shareable.net - the most inclusive sharing website I know, which is itself a portal to many others, as well as hundreds of fascinating articles on this potent aspect of our emerging economy (see especially http://shareable.net/how-to-share )
2. THE CENTER FOR A NEW AMERICAN DREAM'S COMMUNITY ACTION KIT - "GUIDE TO SHARING" - compiled in collaboration with Shareable.net - http://www.newdream.org/programs/collaborative-communities/community-action-kit
Rent-a-tool
Borrowing