To set this up on your own installation, simply download the xml file, upload it to your ftp server and add the following line in the <head> section of your main page:
<link rel=”alternate” type=”application/rss+xml” title=”feed” href=”<$MTBlogURL$>sitemap.xml” />
Description:
This plugin will create a Google sitemaps compliant XML-Sitemap of your WordPress blog. It supports all of the WordPress generated pages as well as custom ones. Everytime you edit or create a post, your sitemap is updated and all major search engines that support the sitemap protocol, like ASK.com, Google, MSN Search and YAHOO, are notified about the update.