This is not keyword search with a layer of natural language on top, says Stochasto CEO Jan Husby. - This is real natural language search based on an extensive database of vocabulary, conjugations, phrases, grammatical rules and semantic contexts.
Two versions of Answer Search will be available. One is a metasearch engine where Stochastic's technology is utilized on results from Google. This will be extended to include Altavista and Yahoo! among others.
The main product, though, is based on indexes generated by Stochasto's technology. It will be available as desktop search, enterprise search and publisher search (for multimedia publications, including CD and DVD disks).
Much more in the Pandia article: The Answer Search natural language search engine.
We've blogged about Kozoru (another natural language answer engine currently in development) and Gurunet here. We also mentioned Ask.com's Smart Search technology and a couple of SMS answer services here.