Hi all,
Today we added the ability to supplement kml super overlays / regions with an alternate url in order to specify a tile cache to hit. You can find some of the details here:
http://docs.codehaus.org/display/GEOSDOC/Google+Earth#GoogleEarth-superoverlay
-Justin
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Justin Deoliveira
jdeolive@anonymised.com
The Open Planning Project
http://topp.openplans.org