I just bought a Fellowes BookLift Copy holder (book stand) and really like it.
I am constantly studying at a desk at home or a table in the library and just putting another book (or five) does not give me the angle that is comfortable or conducive to PhotoReading. This stand allows me to adjust through a full 50-60 degrees and only cost $10 at the university bookstore. It is compact and light enough to carry in my backpack or leave in my locker. Other stands sold there had page clips that seriously got in the way of rapid page turning.
Another option would be the Necksaver II, available at
http://www.thattechnicalbookstore.com/bx92018.htm. Although it is three times the price and bulkier (about the size of a TV tray top), it is more sturdy which would be ideal for keeping at home.