Andrew Sullivan on "Why I Blog"
here. Insights on the nature and advantages of the medium. Much, but not all, applies to academic blogs.
From my first post in April 2006 through our adoption of Kate in March 2008, I posted relentlessly Mon-Wed-Fri. Now it's more like once a week. I suspect that not only the one-year-old child but also the new ipod have cut into my blogging: Many blogging ideas used to come during morning walks, which are now sometimes filled with Frank Sinatra, Al Stewart, or This American Life instead. I haven't decided if this is a good thing or bad.
Oh, and Happy (recent or continuing) Whatever! (Global Orgasm Day, for example.)