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Er? From the FAQ it looks like they use Bing for their searches (among a couple other sources).
To stay off-topic, try blekko.com or bigooya.com. blekko, just like ddg is a young and coming search engine whose results unfortunatly suck if you are looking for non-english content. bigooya is just a metasearch over Google, Bing and Yahoo, but it anonimizes your search and, compared to the others, is fast.