while perusing j.k's website i got a good look at the opening page (as my computer was being a touch slow) and realised all the gum wrappers. the ones in OOTP that neville's mother gives to him at st. mungoe's! i cant believe i only just realised. other than that i noticed little bits of paper with lists of HBP chapter titles and a list of all the members of the Gaunt family. There must be heaps more though, and i bet its important.