From the man who brought us Wikipedia, comes Wikia: an open source search engine, backed by a reported $14 million dollars of venture funding.
Wikia, more or less, is attempting to wrangle the same forces that chiseled Wikiapedia into future world history books, and apply them to a for-profit search engine. A really unsexy way to describe Wikia's idea in reality is this:
Wikia will use a traditional search algorithms to produce a (primitive) "first draft" of any given search result. This first draft's rankings will be open to the public for re-ranking (and moderation). At first, the results will suck, but after the project reaches a critical mass, and has an active user base comparable to Wikipedia's -- guarding and improving the quality of results -- the search engine will blast off into the galaxy, leaving Google orbiting the moon.