Gigablast also has the ability to answer (some) short, natural language questions; although I think that this is more wishful thinking than true fact. However, if you can frame your query in such a way that the search engine will be able to accurately return relevant results, than you might get lucky. Gigablast returns answers ranked in what they call "GigaBits", which basically "enables visitors to easily refine their search based upon related topics from search results." Personally, I found this feature extremely helpful. For instance, I typed in the following query:
My Gigabits came back with 15% going to Christmas trees (not helpful), but 15% also to Tallest Trees and 8% to Sequoia; along with multiple results that easily answered my question. Overall, I'm impressed with the ease of use and quality results...and the retro rocket logo is pretty dang cool, as well.