Andy Armstrong Wiki Map Widgets that make it incredibly easy for Wiki'ers (is that a word?) to embed maps in Wiki pages.
See the simple markup:
[http://www.overwaterlodge.co.uk/ The Overwater Lodge]
[http://www.nenthead.com/ The Miners Arms]
My suggestions:
- Use Mapstraction for easy mapping provider switching, including OpenStreetMap support.
- Support for GeoRSS layers. Easy way to create a large set of markers from a GeoRSS feed (or KML)
- Static image fallback for users without Javascript/slow connections (since Wiki's are not inherently high-bandwidth users)