Microsoft Virtual Earth is this easy to implement
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<script type="text/javascript"
src="http://dev.virtualearth.net/mapcontrol/v5/mapcontrol.js">
</script>
<script type="text/javascript">
var map = null;
function GetMap()
{
map = new VEMap('myMap');
map.LoadMap();
}
</script>
</head>
<body onload="GetMap();">
<div id='myMap'
style="position:relative; width:500px; height:400px;"></div>
</body>
</html>