First, a crowd-sourcing cheat-sheet:

1) You know what crowd-sourcing is even if you don't think you do. Wikipedia is a classic example of crowd-sourcing, "the process by which the power of the many can be leveraged to accomplish feats that were once the province of the specialized few."

2) Jeff Howe literally wrote the book on Crowd-sourcing, based on a 2006 article he wrote for Wired.

Now you're ready for advanced crowd-sourcing:

Jeff recently gave a talk at the Berkman Center for Internet and Society at Harvard. Joshua Benton, director of the Nieman Journalism Lab, said, "Think of the book as a DVD and this talk as the bonus features. Specifically, the director's commentary." Check out the video below.

And to hear Jeff talk about social media and social change, come to Mediabistro Circus 2009.

Jeff Howe on the role of incentives in crowdsourcing from Nieman Journalism Lab on Vimeo.