If you are pressed for time, here's the essence of it in a nutshell. Based on a review of 120,000 of its ebook sales, Smashwords did an analysis of potential factors that could help authors sell more ebooks.
Their analysis provided answers to the following questions:
To read about the findings, I recommend checking out the link to the Smashwords' blog post: http://blog.smashwords.com/
Mark Coker, the guy who created Smashwords, has asked for the word about this study to be spread . Smashwords has my own books in its inventory and, very possibly yours as well. I will be applying the lessons learned to the marketing of my work. I suggest you read the findings of this study and apply them to your own strategies too.