I'm hungry for more info. Could you elaborate? Do you have any updates since November? I don't have much time to contribute, but I've got experience with
GeoServer and
OpenLayers, so if you give me a shapefile (or similar geospatial data file), or a conveniently-formatted database, it won't take long for me to get you an interactive web map up and running. You might want to get in touch with the
Urban Tree Alliance -- I know Emerald Ash Borer is an important issue to them, and
Patricia Lindquist is a particularly knowledgeable, awesome person to work with.