Web 2.0 - Tags
So - in case it's not obvious, Technorati Tags are exactly the kind of coordination mechanism that enable massively distributed information to be easily aggregated and gathered, which creates what I've called distributed economies of scale - when it's cheaper for many 'prosumers' to do the same thing that a bunch of professionals formerly used to do.
I haven't blogged about it much, but let me underline it here: the impact of mechanisms like these is going to be nothing less than tectonic.
Example: here's a fascinating discussion by a pro-am about how the animation in the Polar Express could have been made much better quit easily. Now, think about the same discussion, but multiplied by some amount by cheaper coordination (aka tags, etc) - you've got essentially the beginnings of a form of organization that resembles a firm, but without the corporateness. This is the kind of thing that better coordination mechanisms will begin to enable cheaply, massively, quickly.