"Wikia search" and "Big Think"

From today's NY Times, two new online products/tools to watch:

Wikiasearch - from Jimmy Wales of Wikipedia and wikia.com, this new search engine will use the same voluntary contribution model of Wikipedia to design a Web search engine. The search engine is an open source project and users will be encouraged to rank search results and provide feedback to refine the engine. (http://www.nytimes.com/2008/01/07/technology/07wiki.html)

Big Think - from a Harvard graduate (Peter Hopkins) and former Harvard president Lawrence Summers, Big Think is billed as “a YouTube for ideas”. The Web site "mixes interviews with public intellectuals from a variety of fields, from politics, to law to business, and allows users to engage in debates on issues like global warming and the two-party system. It plans to add new features as it goes along, including a Facebook-like application for social networking..." (http://www.nytimes.com/2008/01/07/technology/07summers.html?ref=business)

Both of these new Web-based services capitalize on the increasingly collaborative nature of activity on the Web...