Aardvark has been described as a social engine i.e. it’s about finding people, not web pages, that have the information to answer your question.
You have to sign-up and join the community to use the service and from what I’ve read it’s reported as good; with answers appearing within 5 minutes.
Google bought them in February this year so they must be doing something right.
Visit Aardvark (http://vark.com/) yourself and see what you think.