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http://dotnetcampania.org/blogs/codiceamano/default.aspx
or here:
http://www.mahamudra.it/
Google Earth C# WrapperEasy to use, easy to go!!!

First you mark up your page with a
<div id="map"></div>, possibly with some width o height through css.
1) you add on the page the script http://www.google.com/jsapi
2) then you use the following straightfoward code
var
ge = new
GoogleEarth(true);
ge.initCallBack(true, true, true, false, false, ritornaMarkers(ge), false);
ge.failureCallBack();
ge.registerShowSun = true;
ge.registerHideSun = true;
ge.isOptions = true;

3) add your markers!!!
public
List<PlaceMark> ritornaMarkers(GoogleEarth ge)
{
var mks = new List<PlaceMark>();
var mk1 = new PlaceMark(ge,
String.Empty,
string.Empty,
40.863D,
14.2767D,
null);
mks.Add(mk1);
return mks;
}