Marker description is overwritten by the marker title in node edit mode.
This is because line 403, in function gmapAdminController.prototype.initializePoints reads
400 marker = new GMarker(new GLatLng(lat, lon), markerOptions);
401 marker.image = image;
402 marker.title = title;
403 marker.description = title;
404 this.attachMarkerListeners(marker);
405 this.map.addOverlay(marker);
rather than
403 marker.description = description;
Not really worth rolling a patch for; just thought I'd point it out.
Excellent module, BTW; I've learned a lot from studying it and reading the Google maps API... thanks!
Pete.