According to ClickZ… "more than half of journalists use blogs in the course of their work".

The Euro RSCG/Columbia study shows that more than 51 percent of journalists use blogs regularly, and 28 percent rely on them to help in their day-to-day reporting duties. By contrast, a recent Pew Internet and American Life Project survey showed that just 11 percent of the U.S. population as a whole reads blogs…

Journalists mostly used blogs for finding story ideas (53 percent), researching and referencing facts (43 percent) and finding sources (36 percent). And 33 percent said they used blogs to uncover breaking news or scandals. Still, despite their reliance on blogs for reporting, only 1 percent of journalists found blogs credible, the study found.