Like networked journalism, these projects are collaborative. They have multiple points or “sources” of information. But open source journalism adds an important element. Either a) the re-release of stories or b) sharing information among competitors. These factors make a project “open.”
Update: I think we are starting to see the emergence of this. ProPublica, the new Huffington Post investigative arm and Spot.Us all make content available to be republished. What happens when everyone starts doing it? We focus less on “scoops” and more on collaboration.