Google+Maps

Maps with Google Maps
 * Powerful, free, extensible, low-bandwidth mapping application
 * [|Google Maps for Educators]
 * Users can add pushpins (placemarks) with details including text, HTML, graphics, more
 * Class collaborations possible (Google accounts are needed however)
 * [|Tutorial: Using Overlays (plugins) with Google Maps] (rising sea level model demonstrated)
 * New overlays (plugins) are created constantly by people outside of Google and made available free to all users
 * Maps can be exported to Google Earth for backup & exploration using that tool