> Given a viewport and an arbitrary point, how wd I detect whether that
> point is inside or not?

Get your point into a GLatLng form, if it isn't already;
Then get the bounds of the map ...
    http://code.google.com/apis/maps/documentation/reference.html#GMap2
then see if the point is contained within that GLatLngBounds object
     http://code.google.com/apis/maps/documentation/reference.html#GLatLngBounds

cheers, Ross K
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