re: GIS in MediaWiki.
With $wgRawHthml = true, the following HTML puts a map in a wiki article.
<div style="float: right">
<iframe
src="http://openlayers.org/viewer/?toolbar=1"
width="400px" height="400px"
scrolling="no" marginwidth="0" marginheight="0"
frameborder="0">
</iframe>
</div>
What modifications might make
wikipedia.org comfortable with the security
of this type of iframe? The whitelist feature in MediaWiki might be
extended to allow particular domain names in the src attribute.
OpenLayers is a young open source project. Upcoming releases will make it
easy to put markers in the maps and to use more backdrop mapserver
accessible on the 'net --- currently it can load WMS and WFS layers.
John