Oh the possibilities. Jimmy Wales, of Wikipedia fame, looks to compete with Google and Yahoo by applying his expertise in wiki to internet search. The stated aim is to acquire 5% of the search market. Regardless of the outcome this is a fundamentally new approach to search that would have to be tried once. If it is successful I'm sure transparent search will find its way into fascinating places.
Wikia Search Homepage
Wikia Search Firefox search bar plugin
Wikipedia on Wikia Search