[curt.clifton]

Originally Posted by Chris

(1) Is there a way to show all actions with a due date of today (and only those actions)?

Not quite, but you can come close by grouping by view date (on the View Bar, if you haven't discovered that yet). Once grouped, you can close the groups for date ranges other than today. The easiest way to do that is to select something in the main context view, then Edit --> Select All, then View --> Collapse All, then click the disclosure triangle next to Today.

(2) What does the "Mark Reviewed" toolbar icon do?

It marks the selected project, or the project containing the selected action, as having been reviewed. See the Project inspector for the date info. and this thread for more details on how some of us are using reviews. (Note that this is probably power-user territory. I used OF for two months before touching the review functionality.