What are Sitemaps?
Sitemaps are an easy way for webmasters to inform search engines about pages on their sites that are available for crawling. In its simplest form, a Sitemap is an XML file that lists URLs for a site along with additional metadata about each URL (when it was last updated, how often it usually changes, and how important it is, relative to other URLs in the site) so that search engines can more intelligently crawl the site. (Learn More)
The big question is what are the benefit's of submitting blogger sitemap to Google Webmaster Tools. The Benefit's of submitting your site's blog to Google Webmaster Tools, you could monitor how Google is indexing your pages, monitor how many pages of your site thats been linked to, Know and see the indexing errors and also it tells you what people are searching in your search bar.
Lets help Google crawl your site more effectively.
*Update~http://digitalinspiration.com/tools/blogger/sitemap/~*
Step 1. Sign-into Google Webmaster Tools Here http://www.google.com/webmasters/
Step 2. Log-in and click add a site map, Enter the URL of a site you'd like to manage.
Step 3. Click continue, and remember you may have to verify that your the owner of the site. Once you verify that your the owner, click the site and head over to the Google site map and add these site maps.
atom.xml?redirect=false&start-index=1&max-results=100
atom.xml?redirect=false&start-index=100&max-results=100
atom.xml?redirect=false&start-index=200&max-results=100
atom.xml?redirect=false&start-index=300&max-results=100
feeds/posts/default?orderby=updated
The submitted site maps should look like the onces below.
A few days later head over to your Google webmaster tool dashboard and view your detailed statistics. These detailed statistics can help you further develop your website.