Creating Content with Questions
One of the best pieces of content that you can write for your site is to answer the questions being asked by your market. The obvious target is your potential customers that you are trying to sell to. If you can answer their questions then you become an expert in their eyes and if you have a product or service that you say can solve their problem then you have built up the trust needed to get them to purchase.
The other group of people whose questions you should target are site owners in general, but site owners in your industry are even better. This group can drive links to your site and if it's a related niche they might be able to drive targeted traffic of prospects as well.
So where do you find the questions that need answered? There are a couple of different sources that I look at.
Yahoo is a great resource. You can either type in your keywords into the search box and see what comes up or you can navigate down into a specific category if one covers your niche. These are real questions from real people and if the questions are current enough, you can even write the post on your site answering the question, then respond to the asker by giving a summary with a link back to your site.
Forums
People also ask their questions in forums. Some forums even have a section with frequently asked questions, which is a great place to get content ideas that can bring you some search traffic. Look for how many times and different ways a question is asked. Take a look at any replies to make sure you know the answer that the poster is looking for or if there are any different angles to consider.
How do you find the forums? Do a google search for "(keyword) forums" and see what comes up. Not all forums are optimized for the search engines though and some high traffic hangouts can go under the radar. You can find these sites by looking at related sites to the forums that you do find. SimilarSites, Google Trends, and the related links section at Alexa are ways you can find other forums.
You can use the Twitter search feature or their advanced search to find questions people are asking right now. What's great about answering questions on Twitter is if you give someone an answer, they are likely to become a follower. Plus, you give a short answer with a link back to your site. This gets potential customers to your site and at the start of the sales funnel.
WordTracker
Just type in a keyword into their Keyword Questions tool and it will spit out the 100 most popular questions asked around the keyword using the question modifiers of who, what, where, when, how and other question-related terms.
The best questions to answer are presell questions. How to use a product or service, which one is better for a certain feature, and how well it solves a specific problem are all good answers to provide.