In Ways of Seeing/Ways of Showing, he writes about Actualities, "simple, direct, filmed accounts of an action or activity: a dancer dancing, a bustling city street, etc."
His first guest blog post introduced what he is planning to writing about from now through February 13:
"Between now and then what I'd like to do is expand on the concept of Climax Ecology as it applies to explicit sexuality in cinema."This sounds fascinating to me, and I will definitely be reading each installment this week.
UPDATE: Here's a link to a post that has links to all his guest blog posts there.