A couple of extensions that allow wiki developers to add Google Maps to their wiki installations — at least, insofar as I can figure it, if they’re using MediaWiki: Extension: Google Maps and Google Maps Widget. Oddly enough, I’ve been thinking about a wiki project idea (that may or may not see the light of day) and was wondering about this very thing. Via High Earth Orbit.
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Have another one .. a GeoRSS plugin for MediaWiki
http://www.mediawiki.org/wiki/Extension:GeoRSS