For the moment, the menu across the top that you will use to filter what you see so it is commentaries by a particular named person, etc., doesn't work. Filtering on two variables is taking some time - it will be available soon.
Z Commentaries are sent every night to all Z Sustainers, and have been for many years. They are a kind of thank you mailing, you might say, for those who are supporting our overall operations.
Commentators are diverse and many. A few of the more prominent ones are listed in the top menu, to show just their work. In time we will add a left menu, up above this text area, and below the generic menu that now appears, with the same purpose, but for more people.