a pithy bit from David Weinberger, international man of miscellany: "Web 2.0 takes what were monolithic apps and breaks them apart so they can be stitched together in new ways.
Tags break apart the world of hyperlinked pages so that we can pull them together around meanings that we, the readers, supply.
But none of this restitching is possible without thread. That's where unique IDs come in..."
read all about it here:
Journal of the Hyperlinked Organization