[Zope] Squishdot moderation question

We've been playing around with Squishdot for a short while, and we never see anything appear in the 'moderation' area. We can review all messages under the 'Postings' tab, but that's what we thought 'moderation' was supposed to be about!? The Squishdot site we've set up is configured so that articles and comments are both moderated, but 'moderation' is always empty. What is the difference between 'Postings' and 'Moderation'?