I have recently been thinking about writing a Knowledge Base web application, but so far it's only the research stage. Today I saw the MozillaZine Knowledge Base which was good inspiration. They seem to have some completely different types of pages. FAQ's, comparison sheets, tips and normal articles.
That is something I hope to have. The type of any piece of knowledge must be considered meta-data. I.e. the structure is separate from the data.
The MozillaZine Knowledge Base sure looks impressive. Do you know any other knowledge bases that you think is impressive?