It’s quite simple! 
Here’s a demo!
Video: How to Embedded a Live.com Map in a Website
And the code!
1: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
2: <html>
3: <head>
4: <title></title>
5: <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
6: <script src="http://dev.virtualearth.net/mapcontrol/mapcontrol.ashx?v=5"></script>
7: <script>
8: var map = null;
9: function GetMap()
10: {
11: map = new VEMap('myMap');
12: map.LoadMap(new VELatLong(47.6, -122.33), 10 ,'h' ,false);
13: }
14: </script>
15: </head>
16: <body onload="GetMap();">
17: <div id='myMap' style="position:relative; width:400px; height:400px;"></div>
18: </body>
19: </html>
I hope it’s useful for you =)
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