Beaucoup- 2,000+ Search Engines, Indices and Directories
Brain Boost- this is an answer engine rather than a search engine. What that means is that "Brainboost actually finds answers to your questions posed in plain English as opposed to directing you to pages that simply mention the questions.”
Dogpile- search Google, Yahoo!, MSN, Ask, images, white and yellow pages.
iTools- search the following all at once: Bing, Blekko, DuckDuckGo, AskJeeves, Google Blog Search, Google Scholar, About.com Topics, Yahoo!, Open Directory, Wolfram Alpha PLUS people searches, Twitter searches, biographies and lots more!
Ixquick- they say they are the "world's most private search engine"
KartOO- KartOO is a metasearch engine with visual display interfaces. When you click on OK, KartOO launches the query to a set of search engines, gathers the results, compiles them and represents them in a series of interactive maps through a proprietary algorithm.
Mamma- "the mother of all search engines".
Metacrawler- search Google, Yahoo!, MSN and Ask all at once
Meta Search Engine- search over 25, including Kayak, Hulu, YouTube, Facebook, Twitter
Pandia- searches Google, Yahoo!, AlltheWeb, Ask.com, Wisenut and more
qksearch- "world's only 3-in-1 search engine": clustering, blended or split search
Turboscout- "access all search engines without retyping"