That’s strange! Where else the site map should be submitted? Definately The site map is for google webmaster tools.
its better but keep in mide..you need to recheck and resubmit your sitemap regulerly for batter response..Like every week.., month..
Submit to the three majors. Google, Yahoo and MSN. Read the Google Webmaster Guidelines for more on this subject. Tom http://www.google.com/support/webmasters/bin/answer.py?hl=en&answer=34575