Another option is that traditional media has caught up with the bloggers and is using Digg to drive traffic to their online sites.
NY Times and Guardian both seem to be providing much more "usable" online content that shows up here, on reddit and digg alot more often.
yeah almost all of them added social networking links to each of their stories, so people are more likely to submit/confirm a new story, and it goes to the top faster compared to a nobody blog that gets 20 diggs a day