SEM - Search Engine Marketing Guide

You can directly submit your sitemaps to ;

Google,
Yahoo!,
Ask.com and
Moreover.com

Following are the steps for automatic sitemap submission :-

1. Open This URL - http://mypagerank.net/service_sn_index
2. Enter the sitemap address
3. Select Search Engines to submit
4. Click on submit button
   
5. Wait for engines response