graphical map-based interface auto-linked to keywords?

Im not sure that I understand your question? This would fire open safari (my default browser) to google maps using 3 bits of string from a files metadata. This would be for a mac only…

#target bridge

var thisThumb = app.document.selections[0];

googleMaps(thisThumb);

function googleMaps(t) {
     var md = t.metadata;
     md.namespace = "http://ns.adobe.com/photoshop/1.0/";
     // Make a url
     var Url = "open 'http://maps.google.com/maps?q=";
     Url += md.City + ", ";
     Url += md.State + ", ";
     Url += md.Country + "'";
     //$.writeln(Url);
     app.system(Url);
}

The example is just for the first selected thumbnail…