Earlier this week, Columbia Journalism School’s Tow Center for Digital Journalism released a mega 140-page plus report on the biz of digital journalism.

Entitled “The Story So Far”, the report opens by saying its authors wanted to address a top-of-mind question for many journalists: “What kinds of digitally based journalism in the U.S. is the commercial market likely to support, and how?”

What follows is an exhaustive study, covering everything from paywalls, to aggregation, to audience — and more.

Even with all this wealth of information, however, the report also adds:

“We recognize, finally, that digital journalism is such a dynamic field that some of the findings and conclusions we reach in May 2011 will be outdated within months. That is what makes this subject so fertile for researchers and so humbling for seers.”

Want a Canadian perspective? Come to the Canadian Journalism Foundation’s May 17 forum: Meet the Minds Behind Canada’s Online News Start-ups. Panelists include: Jeff Anders (The Mark), James Baxter (iPolitics), David Beers (The Tyee), and Wilf Dinnick (Open File). The Q&A discussion is moderated by BNN host Andrea Mandel-Campbell.