For information on rendering maps on the front-end of your Umbraco website, please read Darren's blog post.
There have been several reports of the Google Map not appearing within the back-office. We have pin-pointed this to be an issue with the Client Dependency Framework. To workaround this issue, we have added an option to disable its use.
<add key="GoogleMaps:DisableClientDependency" value="true"/>