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Also, I think making this ebook only missed 90% of the actual target market. Does Mary, the office admin, have a Kindle/ebook reader? She may, but statistically if she does she probably needs this book less than someone who does not have a Kindle/ebook reader.

I should have mentioned this up front on the sales page. Buyers can be issued a full refund if they don't find it helpful at all. I just added a note right below the "Buy" button.

thanks for the feedback. Are you saying the preview isn't long enough or that the viewing format is poor on slideshare?

Both!

I think you should add in a later chapter to the preview. For example, the chapter on Redis or Memcache. Basically, I want to know how in depth you explain each topic.