In August, Health and Human Services Secretary Mike Leavitt became the first cabinet secretary to have his own professional blog, which HHS says receives hundreds of visits per day.
Homeland Security Secretary Michael Chertoff, the State Department and the Environmental Protection Agency also keep blogs.
Leavitt says his blog "allows me to think out loud a little bit" and "forms a little bit of a journal," although "some of it I'm obviously circumspect about in my deepest feelings."
He takes his blogging quite seriously: writing from his Blackberry at all hours, responding to comments and making sure to post several times a week.
Leavitt talks with Melissa Block.