- Appropedia:CategoryTree - a nice clear starting point
- Appropedia:Fundamental category tree - for the more serious wiki user
- Help to develop and apply navigation templates, e.g. Appropedia:Topic and category headers.
- Help with categorization, so that all categories are subcategories of higher level categories. Instructions at Appropedia:Fundamental category tree.
Ideas & examples
- GrassrootsWiki looks nice and has good sidebar and topic page navigation.