I have been doing some research on the statistical side of marketing. Its already well known that long tail key phrases are a really good way to garner target traffic with little competition. For example, a good percentage of Amazon's sales are little niche products such as obscure books that only a small percentage of people are looking for. The long tail in statistics is a type of power law distribution. What does this mean to us? Sales can be maximized by taking advantage of power law distributions, the most recognizable application being in keyphrases. Its a long known marketing strategy; rank for as many long tail key phrases as you can, and while your traffic is low per keyphrase, it adds up as you add more. Its a brilliant strategy, and remarkably simple. I'll bet its not as appreciated as it could be. Look up "long tail" in Wikipedia for more really interesting information. Perhaps the use of statistical analysis can help you come up with creative ways to increase your income! Heck if Amazon uses similar strategies you know there is definitely something to it. But just wanted to share this, thanks.