Google, Microsoft and Yahoo! are coming together in support of the SiteMaps protocol. The goal of this united effort is to standardize on a common protocol that will improve search results for customers on the major three engines. The protocol enables site owners everywhere to tell search engines about the content on their site instead of having to rely solely on crawl algorithms to find it.
Other search engines are also invited to use the system — and it has specifically been placed as open property through Creative Commons. IAC’s Ask.com was not part of the announcement.
Sitemaps.org is the official website.