Enhancing WikiQuickies. Some pages contain only a URL. An enterprising housekeeper follows the link, explores, and puts a sentence or two in Wiki explaining why someone else might want to follow the link.
Connecting. Backlinking pages to their context from where they are referenced.
Refactoring pages for a number of reasons: RefactoringWikiPages.
Formatting pages to make them faster readable.
Categorizing pages to make searches by Category more useful. CategoryCategory