I think the only search engine algorithms as well but there are still some differences, such as Yahoo is worth more than the contents of the site and it does not insist much on dofollow and nofollow attributes.
Bing and Yahoo are now also check the links to reports and statistics, and the site in their ranks. A few years ago were very interested in providing the best sites have a higher keyword density, but the situation has changed.
All the search engines have almost similar algorithm for indexing of websites with slight differences. Yahoo indexing is based upon quality of your web content.