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By the third day of any conference, one’s eyes begin to glaze over. But Lisa Gansky provided an intellectual jolt on the final morning of the Cleantech Forum in San Francisco this week when she appeared on stage to talk about “the Mesh.”

That’s what Gansky, a veteran Internet entrepreneur, calls the confluence of social networks, GPS-enabled mobile technology (smartphones, iPads, and the like) and the tagging of physical objects with chips that pinpoint their location.

“The Mesh is a fundamental shift in our relationship to the things in our lives,” said Gansky, who has written a book by the same name. “We’re moving to an economy where access to goods and services trumps ownership of them.  The opportunity of the Mesh is to really design and support better things easily shared.”

“The recession has caused us to ask what the real value of things versus the cost,” she added. “This is a time where we’re more connected to more people than ever before.”

And so in recent years, we’ve seen the rise of a panoply of peer-to-peer services, beginning with music sharing in the Napster era to peer-to-peer money lending to car sharing.