Be sure to check out Skirmisher Publishing's popular TSRPG (Travel Sized RPG)! This rules-light storytelling game can easily be played anywhere, from the airport waiting area you are stuck in, to the overnight in some hotel where there is nothing to do (and also, of course, in your own home). All the basic rules fit on one page; no dice are needed; characters have just two stats; and any bookkeeping that might be required can be done on a cocktail napkin with a pen borrowed from a waiter.