duckduckgo.com is a new and interesting search engine. It has its own bot, but it also relies on Bing for much of its search results. Often it provides the answer to a search via integration with Wikipedia, Wolfram Alpha or another service.
There are keyboard shortcuts, search modifiers, etc… on their goodies page.
Let’s see if WordPress will let us embed a search box:
Nope, use the link above.