Do you still use a phone book?
Phone books may be slowly going the way of the Dodo but many people still find them useful and several more make millions selling advertisements in them. The Slate article I just linked you to also mentions the novelty factor of looking up your favourite authors or celebrities in an old volume (Bram Stoker on Victoria-1436 or P.G. Wodehouse on Kensington-4150).
We also did our own bit of research on phone books and found that genealogy researchers and history buffs have been known to pay top dollar for old directories.
