In the last few years, Google has attained the ranking of the #1 search engine on the Net, and consistently stayed there. Users are attracted to its mammoth listings and ease of search; and with the launch of Google’s PPC program (Pay Per Click) business sites are utilizing it more and more as well to help them in the marketplace.
Dogpile is a meta search engine, meaning that it gets results from multiple search engines and directories and then presents them combined to the user. Dogpile currently gets its results from Google, Yahoo, MSN Search, Ask , About, MIVA, LookSmart, and more.
Answers.com is an innovative way to find answers on the Web, without searching for them. Instead of going to your favorite search engine and typing in a query, then sorting through various links to find the answer that you are looking for, Answers.com "displays quick, snapshot answers with concise, reliable information." Answers.com's tagline seems to sum this up: "the world's greatest encyclodictionalmanacapedia."
Ask.com, or just Ask, is a crawler-based search engine with lots and lots of cool features. Ask also is the parent company of such notable Web destinations as Ask for Kids, Bloglines, and Teoma, which is the underlying search technology for Ask's search.
USA.gov, formerly known as FirstGov.gov, is an absolutely mammoth search engine/portal that gives the searcher direct access to searchable information from the United States government, state governments, and local governments.
Technorati is a real-time search engine dedicated to the blogosphere. It only searches through blogs to find exactly what you're looking for. At the time of this writing, Technorati was tracking over 22 million sites and over a billion links, a mind-boggling amount.