Alliances, buyouts, and joint ventures are rampant in the search engine and search directory industry, and this is a very dynamic situation. Even in cases where there may be no ownership stakes, a few major engines serve their results through others. For example, at this writing, Yahoo also serves AltaVista, and Open Directory also serves AOL Search, Netscape, Lycos, and Hotbot.
This is actually good news for Web-site owners, because once your site is listed with one of the major players, it will likely also be listed in the results of other services. Because of Google's amazing ascendancy in the industry, it is often said (and we at nSiteful have often said it) that, arguably, the only search engine you need to worry about is Google.
If you want to stay updated on the ever-changing relationships within the Web search industry, check out this page at
SEARCHENGINEWATCH.COM (opens in a new browser window).