Thank you, Grandma, for this information. I am a newbie in every sense of the word! I bought the Sony 505 thinking I would just buy and download books from the Sony Connect store. I had no idea there were free books out there, not to mention formats and formatting versions... I was sort of at a stand still until I found this site.
So thanks again, Grandma, for remembering that we all have to start at the very beginning!