The ping module is useful for notifying interested sites that your site has changed. It automatically sends notifications, or "pings", to the <a href="@external-http-pingomatic-com">pingomatic</a> service about new or updated content. In turn, <a href="@external-http-pingomatic-com">pingomatic</a> notifies other popular services, including weblogs.com, Technorati, blo.gs, BlogRolling, Feedster.com, and Moreover.