A large majority of searches performed online each day are questions.
Questions are often centered around problems, and problems are
something that can generally be monetised with ease. Yahoo! own a huge
knowledge-base of questions and answers on the aptly named Yahoo! Answers.
Simply enter any terms relevant to your chosen industry into the
search box and you’ll see relevant questions around that topic. You can
even sort these by which are the most popular, to find out what that
audience is really passionate about.
http://www.viperchill.com/keyword-research/
