Excellent piece about blogs + The Long Tail. The quiet power of targeted communities represented by blogs will disrupt marketing, advertising and the economics of media. We've come a long way since people wondered if a TV channel about sports and nothing but sports would have a chance of making it.
There is power in the conversations going on around you, and not necessarily from the places that you'd ordinarily expect. Companies that work in conjunction with the trends going on in the long tail: e.g. fostering peoples voices, listening to and incorporating their comments and feedback, and fostering a community have a tremendous opportunity awaiting them.