You can find the full source code for this website in the Seam package in the directory /examples/wiki. It is licensed under the LGPL.
Download latest release from GMaps4JSF
Add script element to head tag of template.xhtml
<script src="http://maps.google.com/maps?file=api&v=2& key=ABQIAAAAxrVS1QxlpJHXxQ2Vxg2bJBT2yXp_ZAY8_ufC3CFXhHIE1NvwkxS9AOPy_YJl48ifAy4mq6I8SgK8fg" type="text/javascript"> </script>
Add in the namespace to your view
xmlns:m="http://code.google.com/p/gmaps4jsf/"
Example of google maps with map and controls
<rich:panel>
<f:facet name="header">Google maps</f:facet>
<m:map address="Dublin" width="500px" height="500px">
<m:mapControl name="GLargeMapControl" position="G_ANCHOR_BOTTOM_RIGHT"/>
<m:mapControl name="GMapTypeControl"/>
</m:map>
</rich:panel>