>>>Have you look at the Wiki: fox.wikis.com. It's a searchable knowledgebase of mostly FoxPro information.
I don't think the way things are stored, searched and retrieved in a wiki is something that applies here, IMHO. Think that a specific app oriented to that specific service must be employed (and developed to that purpose).
A powerfull search engine (not just fast, but supporting many options), clean results presentation and further document browsing is a must have, among many other goods. Also think that compensating the work done (article writing) is a good motivation, too, and should be strongly considered.
Fernando