Yahoo Site Explorer allows you to add any sites that you would like to track or authenticate to your “My Sites” page. Simply add your sites to your “My Sites” page and follow the prompts to register and authenticate. Google essentially is the most popular search engine, however there is value in registering with Yahoo as it is still one of the major players. Site Explorer also allows you to explore all the web pages indexed by Yahoo! Search. View the most popular pages from any site, dive into a comprehensive site map, and find pages that link to that site or any page.