The worldKit GeoWiki a complete application ready to download
, install and use on your server. It is a publicly editable map. Annotations are made directly in the map, can be assigned tags that are displayed as a weighted list, with all submissions and updates data handled in the background with Ajax. There is a working example here
Unpack the files from the download, and place them in a single directory on your webserver. Make sure the files "rss.xml, tags, tags.count" are all writable. Load the url for this directory in your browser, and it's ready to go.
The app can be customized just like any worldKit map. Choose base map imagery, different extents, etc. It can be used as a guideline for other projects, a working tutorial. This has just be released, so there may be some rough spots. Please feel free to send feedback