Finally worked my way through the very useful report We Media [3] by Shayne Bowman and Chris Willis at the Media Center at the American Press Institute. A good overview of what they term participatory journalism, with many connections to my own research. From this report, several further references also need investigation:

• Articles by Clay Shirky: The Music Business and the Big Flip [4], Broadcast Institutions, Community Values [5], and RIP THE CONSUMER, 1900-1999 [6]
• More background information on blogging: Blogosphere: the emerging Media Ecosystem [7] and The Tipping Blog: How Weblogs Can Turn an Idea into an Epidemic [8] by John Hiler, Reputation Systems: Facilitating Trust in Internet Interactions [9] by Paul Resnick et al. [PDF], and "Interactive Features of Online Newspapers" [10] by Keith Kenney et al. in First Monday
• A description of blogging as 'Random Acts of Journalism' [11] by JD Lasica as well as the panel discussion "New Forms of Journalism: Weblogs, community news, self-publishing and more" [12] with Lasica and others, and the useful Beginner's Guide to TrackBack [13] at Movabletype
• The book Unleashing the Ideavirus [14] by Seth Godin
• Some other useful links, on more or less related topics: Kaitiaki [15] is a NZ-based open news site of sorts; Wi-Fi Networking News [16] is interesting both as an open news site and for its content; and I've been meaning to keep an eye on the BBC's opening up of its archives [17] in case there are some juicy archived shows emerging from this.

Phew.