It's become part of our vernacular. I cracked up when Castle said it in a recent episode. Here's one I discovered today: a virtual lighter. Perfect for concert goers. I was watching Oprah this afternoon and during Elton John's performance of Tiny Dancer (my fave!) there were audience people holding up their phones with flickering flames. The coolest! I don't even have an iphone but had to share this. Found via Alan @ Artoftheiphone.com (You can also search lighter or glowstick on itunes).
When Graham took Peter to his first concert (KISS) the band requested that everyone open and hold up their phones (back when they still had hinges) and the place was glowing in white and blue. No burned fingers (or hair) or sore thumbs from reflicking. I thought that was remarkably clever....until I saw these. I think I have a reason to get an iphone now ;)