Re: wiki: page-specific view/edit permissions?
Yep. Pre-1.9, you can assign individual permissions for specific pages (which is a pain in the butt). In 1.9, you can assign permissions for entire categories. That way, you can categorize groups of pages and have them all obey the permissions assigned for the parent category.
See CategoryPermissions for more info. You can also check out this feature in the latest 1.9rc release.