Ever since Motorola introduced the Razr almost two years ago, it's been no secret that America is absolutely mad for the slim handset. We can't talk about cell phones anymore without discussing the Razr and the thin phone phenomenon is showing no signs of abating. Yet despite the fact that its enormous popularity is obvious--take a look around you--it was only this weekend that I learned just how popular the Razr is. Two nights ago I went to a Death Cab for Cutie concert at the Greek Theater in Berkeley. After a half-hour or so I noticed that scores of people in the rows below me were using their phones to take pictures, sneak a quick film clip, or hold up the display like a light. In addition to wondering whatever happened to cigarette lighters, I realized that almost every phone in the crowd below was some type of Razr (yes, I know that makes me a geek). It was really amazing actually to see so many versions of the same phone in one place. So, yes, Virginia, the Razr really is popular.