Google Maps has added the ability to overlay information files created in the Google Earth format. You can now point Google Maps to .KML and .KMZ files on the web and the information will be displayed on Google Maps. The example on this page is of a map of Portland schools I created using Google Earth. I then posted the kmz file to my web server. Just paste the web address of any .kml or .kmz file into the search field of Google Maps and the associated data is displayed in Google Maps. Click on the screen grab to load the school location information into Google Maps.