To follow on from the last blog post, I made a google code page for the server assist overlays. This is a demonstration of how to use GDAL to build geo-referenced images and pixel maps for user interaction on the fly.
This allows for lots and lots of polygons/lines/points to be drawn and still allows the user to interact. This is useful for when your data is too large for the javascript overlays of google maps to handle.
Take a look:
http://code.google.com/p/server-assist-overlays/
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