Hm, definately two suggestions to keep in mind. Zonx's idea of seperate xml's loaded for each map (well, for their icon pages anyway) would work well with the external program idea + database, and, if we can figure out how to make a drop box work for us, your idea would work well for on-the-fly filtering Killarny.
The thing is, dropboxes seem to be ornery... I haven't had much luck getting them to work for me. A faked drop box using button and page objects would probably do exactly what you're thinking though... hmmm...
Also, it wouldn't take duplicate POIs, just show multiple pages of POIs at once (splitting the POI types up between page objects), so it's a very viable suggestion.
Quib
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