Google released Sitemap 0.84 XML protocol under the Attribution/Share Alike Creative Commons license in the hopes that other search engines would adopt the protocol too. And today, They're excited to announce that Yahoo! and Microsoft are joining us in officially supporting the Sitemap protocol.

You can submit your Sitemap file to Google using Google webmaster tools.
http://www.google.com/webmasters/sitemaps

Any site owner can create and upload an XML Sitemap and submit the URL of the file to participating search engines.
http://www.google.com/webmasters/sitemaps/docs/en/protocol.html

sorry for third post...:)
via http://www.google.com/press/pressrel/sitemapsorg.html

Live.com's Post.

http://livesearch.spaces.live.com/Blog/cns!8560B877FE8E9138!1231.entry

Yahoo's Post.

http://www.ysearchblog.com/archives/000380.html