Nabokov wrote his later novels on index cards. The same is true of his unfinished last attempt: The Original of Laura. The manuscript is supposed to be published in November (and not burned, as Nabokov requested, and his son apparently contemplated doing for many years). According to Mark Horowitz: "The finished book will include facsimiles of every card, on perforated paper, so that readers can reshuffle them. It's a perfectly Nabokovian concoction, a tantalizing puzzler from the beyond."
I am looking forward to it!