The googleMaps plugin has just been updated: v1.0.19 (for Joomla 1.0), v1.5.19 (for Joomla 1.5), v1.6.19 (for Joomla 1.6), v1.7.19 (for Joomla 1.7), v2.5.19 (for Joomla 2.5)

New Features

Thanks to persistence and many rounds of testing by Eric L, the googleMaps plugin now supports zoom and InfoWindow with KML files!

Download here: http://extensions.joomla.org/extensions/maps-a-weather/maps-a-locations/maps/8213

Tutorials here: googleMaps plugin Tutorial 05: KML Files