Marketing Books Online
by Christopher Diggins
Related link: http://www.cdiggins.com/marketing-books-online.html
If you aren't an author, you should still find the article useful. Just substitute your product or service in place of "book" and ignore the bit about Amazon.com and you are ready to roll.
Does the article need more or less?
Thanks thats a really good article. It gives a good overview of the subject of which you go deeper.