Some that has an guide on have to create an Visual WebPart using Google Maps for an list....
protected override void Render(HtmlTextWriter writer)
{
string rScript = "";
rScript += "<script src=\"http://maps.google.com/maps?file=api&v=2&key=" +
m_rGoogleKey + "\"\n type=\"text/javascript\"></script>\n";
rScript += "<script type=\"text/javascript\">\n";
rScript += "//<![CDATA[\n";
rScript += "function Init()\n";
rScript += "{\n";
rScript += "var map = new GMap2(document.getElementById(\"map\"));\n";
if (DisableDragging)
rScript += "map.disableDragging();\n";
rScript += "var latlng = new GLatLng(" + m_dLatitude + ", " + m_dLongitude + ");\n";
rScript += "map.setCenter(latlng, " + m_nZoomLevel + ");\n";
if (DisplayZoomControl)
rScript += "map.addControl(new GLargeMapControl());\n";
rScript += "map.addControl(new GMapTypeControl());\n";
rScript += "var mkr = new GMarker(latlng);\n";
if (DisplayIcon)
rScript += "map.addOverlay(mkr);\n";
rScript += "}\n";
rScript += "//]]>\n";
rScript += "</script>\n";
rScript += " <div id=\"map\" style=\"width: " + GWidth + "px; height: " +
GHeight + "px\"></div>\n";
writer.Write(rScript);
if (!Page.ClientScript.IsStartupScriptRegistered("MapInit"))
Page.ClientScript.RegisterStartupScript(typeof(string), "MapInit",
"Init()", true);
}
