In the Jay Rosen video on the ethics of blogging I posted yesterday, Rosen at about 26-minute mark of that video explains the difference between public journalism and citizen journalism.
If you just keep clicking on the video advance button on the video, it will take to that 26-minute place.
As you might know, the Harnisch Foundation under the direction of Ruth Ann Harnisch gave us a substantial gift to start the Center for for Sustainable Journalism at Kennesaw State University. We are up and running. Keep abreast of what is happening at SustainableJournalism.org 
Leonard Witt is the Robert D. Fowler Distinguished Chair in Communication at Kennesaw State University and the chief blogger of PJNet. His academic interests include public and citizen journalism and how to get citizens' voices heard. He has spent most of his professional career as an award-winning journalist.