Fortnight is a great word and very useful too. Things frequently happen in two-week periods: meeting schedules, vacations, other things I can't think of. I would be great to be able to say "see you in a fortnight" as opposed to "see you in two weeks" or at least I think it would.

To be fair, I don't really know anything about The Cheerleader. When that title came out of the hat my first reaction was "that better not be by Christopher Pike". It's not, but the way the chooser described it made it seem like a teenage scare-tactic/morality book. I don't know if it was ever popular.