for me, it would have the be the book, "the beatles chronicles", which is basically a diary of what the beatles did, EVERY day from about 1960 to 1970. i have read it the whole way through. its about a million pages or something.
or, my video, "Alf Bicknalls Bealtes video diary", in which Alf Bicknall (who was the beatles' driver) goes round to places remembering stuff. a personal favourite is when Alf is standing OUTSIDE abbey road studios and says, "yep, i remember when the beatles, john, paul, george and ringo (which he says EVERY time), were coming out of here, and paul fell over. (looks into the distance), what great times...." its amazing