http://www.google.com/webmasters/tools/ping?sitemap=
http://search.yahooapis.com/SiteExplorerService/V1/ping?sitemap=
http://submissions.ask.com/ping?sitemap=
http://api.moreover.com/ping?u=
http://webmaster.live.com/ping.aspx?siteMap=
http://www.bing.com/webmaster/ping.aspx?siteMap=