Those who have been around on the web for a long time are almost certainly familiar with the Yahoo Site Explorer. This service, while it offered a good spread of webmaster-oriented features, was used most popularly as one of the three places each site mustsubmit a sitemap (the other two being Google Webmaster Tools and Microsoft Webmaster Central). Yahoo Site Explorer seems to have outlived its usefulness, however. Itís slated for shut down later this year, as are all associated APIs.
http://www.searchenginejournal.com/yahoo-site-explorer-shutting-down/31102/