Or buy yourself some ads in town, stuff them with a bluetooth-sender and let people download some chapters of your books. Yes, like those ads where you can download new tunes for your mobile .. (At least they are present in some of the bigger German stations - e.g. from Coke or Mars, letting you download their ad-jingle as a tune via bluetooth. I saw quite a number of people using that service).
The plane-idea is MUCH cooler though
