If you want to automate the way in which you submit your new websites to the major search engines, try using the sitemap.xml pinging service. You just replace [FULL SITEMAP URL] with a URL encoded version of the full URL of your sitemap and then GET request each ping service.
http://www.google.com/webmasters/tools/ping?sitemap=[FULL SITEMAP URL] http://search.yahooapis.com/SiteExplorerService/V1/ping?sitemap=[FULL SITEMAP URL] http://search.yahooapis.com/SiteExplorerService/V1/updateNotification?appid=SitemapWriter&url=[FULL SITEMAP URL] http://submissions.ask.com/ping?sitemap=[FULL SITEMAP URL] http://www.bing.com/webmaster/ping.aspx?siteMap=[FULL SITEMAP URL] http://api.moreover.com/ping?u=[FULL SITEMAP URL]