Here is another great widget for Blogger powered blogs. Table of contents widget. This widget automatically generates a sitemap of your blog. With such sitemap, it is easier for your visitors to look at complete structure of your blog. This widget displays your blog posts according to their categories and "New!!" text is shown for the 10 latest posts.
Although this functions like a sitemap, it cannot be submitted to Google Webmasters Tools. Because, Google webmaster tools just accepts sitemap in XML format. You can get detailed instruction on submitting sitemap to Google here.
So, all you have to do now is just copy the code below and paste it into Blogger Static Pages or any post pages. Then, publish it. You can see a demo of this widget in my Table of Contents page.