Just thought I'd share an experience I had some time ago.
I photoread a book on mind mapping by Tony Buzan perhaps 12 - 18 months ago.
One day when I was going through the photoreading course I decided I wanted to know more about mind maps and how to use them effectively.
I don't know quite what made me pick up the book (I'd almost forgotten I had it) but I thought of what I needed to know/what information would be useful to me and then actually turned to the exact page I needed.
To say i was amazed is an understatement - this was certainly something that proved to me that photoreading does work ! 
Fraser