These are the most popular (widely used) search engines as of early 2005.
Yahoo! and Google are in a virtual tie for the number of searches performed per day. Google is losing ground to Yahoo! as its searches are not as relevant as they were prior to November 2003.
MSN produces search results that are more relevant to women. Dogpile is a directory that pulls results from several sources. Kartoo is a relational search engine, a different approach that can help you narrow your search in a few clicks.