The essay co-authored by Tim O'Reilly and John Battelle, two of the Internet's terrific thinkers, is some of the richest writing on the evolution of digital media you'll read.
Better that their words occupy the screen, but in summary, they discuss the emergence of the digital power of the collective mind, with cooperating systems, implied metadata, sensor-based information, the generation of mapping from unstructured data, and real-time information guiding businesses.
It's an eloquent look at the last five years and the possibilities of the time ahead.