Google Sitemaps Changes Names
Recently Google Sitemaps has been renamed by Google to "Google Webmaster Tools". Since its debut, the system has expanded to offer a lot more than just XML Sitemap submission and includes crawl, indexing, and query, page analysis, and more.
The name change was put into place to better reflect the scope of products and tools available to webmasters.
You can read more at sitemaps.blogspot.com