Google.com Sitemap submission
Google has a suite of tools for managing your relationship between your web sites and them. They call this suite Google Webmaster Central. It is here that you will register your web sites with validation files. Once they've established you are the webmaster of your site, they will present you will a screen to submit your sitemap. You will need a Google Account for this process. If you don't have one, follow the link to Create a Google Account.