Well now this is a cute little trick. Ouriel of Le French TechCrunche was futzing around with his iPod when he found that a 1-to-2 prong airline adapter holds up his iPhone like a champ. PHa and I had a hell of a time trying to keep an iPod nano standing on the flight to Germany and this would have helped immensely.
iPhone Hack to make it stand still (without touching it of course) [Ouriel]