There's a cute article in the New York Times (free reg. req'd) about annoying people on planes, and what you can do about them: If Only the Flier in Front of You Were a Fan of Miss Manners
. I had no idea before reading this that some people actually watch porn DVDs in flight on their laptops—eew. Or that there was something called the Knee Defender that keeps the tray table from collapsing, so the seat in front of you can't recline.
Anyway, it's an interesting read.