Something Wiki Is Coming to the Web Search Market - New York Times

Also see this article for an overview of some other potential  search disruptors

The project, called Wikiasari for now, was announced in December by Wikia, a for-profit company co-founded by Jimmy Wales, the former options trader who has been the public face of Wikipedia. Like Wikipedia, a wiki search engine would be based on the idea that volunteers can do the work of paid specialists — in the case of search engines, the work of sophisticated computers that evaluate Web sites for relevance using secret criteria.

Source: Something Wiki Is Coming to the Web Search Market - New York Times