• editable pages, just like a normal wiki
• geographic metadata: address, postcode, telephone, lat/long, etc
• categorisation metadata (type(s) and area(s) of subjects of pages)
• search by location: "show me all things in range '1km'."
• RDF output version of all pages and listings; you can plug this into other applications like Mapufacture (Google Maps, anyone?)

Examples: rendered page, editing view,location search, RDF version, Mapufacture displaying RDF listing