DuckDuckGo is a general purpose search engine which gives instant answers with less spam and clutter, many goodies etc
It has features like personalize homepage, tools, plugins, add-ons, location awareness, keyboard shortcuts, zero click info sources, Add to firefox etc
From the main windows itself you can search the keyword on Amazon, Images in Bing and Google, Maps, news, Wikipedia, Youtube etc
Web : http://duckduckgo.com/