It looks like it is working if you don't specify an API key:
<script type="text/javascript" src="//maps.googleapis.com/maps/api/js?key=AIzaSyBhSg6I2JvHNU_jLqIpvc5MEwc_xi3Ttvg&sensor=true"></script>
vs
<script type="text/javascript" src="//maps.googleapis.com/maps/api/js?sensor=true"></script>
(Taken from http://www.google.com.au/about/jobs/locations/sydney/)