"The anticipation, which is intense even by Jobsian standards, has led to some quiet, behind-the-scenes anxiety at Apple. Some Apple executives worry privately that expectations for the one-button phones may be too high and that first-generation buyers will end up disappointed."
They're right to be a bit nervous. We don't doubt that the iPhone will sell like crazy when it first comes out and be hard to find in stores for months, but it's rare for anything this highly anticipated to completely live up to everyone's expectations. The iPhone's on pretty much the most massive pedestal that any gadget has ever been on, and if there are any issues with it -- like with its touchscreen, battery life, call quality, or software stability -- you can expect the backlash to be severe.