Here are some helpful articles for submitting sitemap to search engines

• How to Submit your sitemap to Google, Yahoo, and MSN 
• http://www.websecurity.mobi/webmaster-tool-sitemap-generator/72-how-subm...

Besides, below are some more URLs to submit:

• http://search.live.com/docs/submit.aspx
• http://api.moreover.com/ping?u=http://yourdomain.com/yoursitemap.xml
• http://webmaster.live.com/