For your second suggestion "Least Reviewed", using the search option under the "Story Archive" section on the left side. Choose "Number of Votes" and "Ascending" then click 'show stories' button. When you say "Most Recently Reviewed", how are you going to define 'recently', last week, last month?
OK! Got it. Might have known you had it covered! There are 277 stories without a review. As for most recently reviewed I was thinking of generally the most recent order, although I guess it depends on whether you store that date in the stories database.

Oh well, better get on with my reading I suppose....