overlaying text on a live view of their phone's camera feed, but now their iPhone counterparts get to join in the fun as well. MegaReader, an e-reading app that's survived the cutthroat App Store waters long enough to reach version 2.1, has just added a "Heads Up Display" feature to its list of attributes. Its function is to make your iPhone appear transparent, which is achieved by relaying camera images of what's behind the phone to its front. A real life saver, a mere gimmick, or a golden opportunity for a hilarious promo video? Why not all three?