This is going to be an ongoing discussion, this seems like it's a discussion a lot of people want to have, but can't find a peg to hang it on. The recent San Francisco court decision in a case where Apple sued some bloggers for publishing internal information led to several forums (fora?) taking up the issue. And if you listen closely, even though (at least as I understand it) the court based its decision on whether anyone had the right to publish "stolen" information and didn't quite rule on whether bloggers were journalists or not, everyone seemed to used that as a starting point for a discussion of the question they really wanted to address. Here's an example:
One reader even pointed out that the sites in the SF case aren't even blogs--some predate blogging as a technology and a phenomenon.