I got it to work. First you need to get your own googlemap key from here.
Then you need to download the googlemap.js source. I got a copy from here.
Then you need to include the following references:
<script type="text/javascript" src="http://maps.google.com/maps?file=api&amp;v=2&amp;sensor=false&amp;key=PutYourKeyHere"></script>
<script type="text/javascript" src="~/Scripts/googlemaps.js"></script>
<script type="text/javascript">
jQuery(function($) {
$("#map").googlemap({ addresses: ["1 ABC ST, NSW 2193 Sydney, Australia"] });
});
</script>
And put a div in
<div id="map" style="width: 500px; height: 300px"></div>
Note: this plug-in seems to require an id not a class. For example if I define my div to have class="map" instead, $('.map').googlemap() fails with a null reference.