Google www.google.com Probably the worlds biggest search engine. It has a map feature with 'street view.'
Bing www.bing.com Microsoft's search engine. Its map search feature has Ordinance Survey maps for most of the UK.
Dogpile
MetaCrawler
WebCrawler		 www.dogpile.com
www.metacrawler.com
www.webcrawler.com		 These are multiple engine searchers: Google, Yahoo! and Bing. They all use the same 'Metasearch Technology.'
DuckDuckGo duckduckgo.com A search tool that does not collect or share personal information.
ixquick ixquick.com Another search engine that protects privacy. This has an image search option.
Exalead www.exalead.com This show thumbnail page previews and has some interesting search features.
Ask Jeeves www.ask.com A question and answer based search engine.
Refseek
Google Scholar		 www.refseek.com
scholar.google.com		 A couple of academic search tools.
Omgili omgili.com Searches forums, discussion groups and mailing lists.
Gigablast www.gigablast.com A 'green' search engine, which has a search directory feature. However, it does not give its privacy policy