PR'ing is great with fiction--just PR it, then rapid read. Usually my purpose is to enjoy the book, etc.
PR'ing combined with ImageStreaming afterwards about who did it (in a murder mystery) is the absolute funnest thing to do. You get the killer's description from the IS. You find who the killer is from this as you rapid read.
Such a sense of satisfaction--I have never been wrong with this technique! (smirky smile)
Whoah! Did I write that? 
