It is very important not to try and guess what words to use when optimizing your content for search marketing. Don’t use keywords based on your hunch. Rather use professional tools to get the facts!
Free tools linke the Overture keyword selection tool do not work and often lead you to target far inferior phrases than what is available and from what phrases have a know searched for audience. For that reason it is of the utmost importance to use professional tools like Wordtracker, Keyword Discovery and Analog X.
Look for more posts about each of these keyword selection tools in the near future. And of course, the goods are available by subscription.