Punch Media, the iPad-native magazine service, is hoping to create a new model for tablet-based advertising. Rather than featuring conventional pop-up or display ads, Punch is working with brands to develop application-style advertorial units, encouraging user engagement by offering media-rich, genuinely interesting or useful content. "We wanted to do an ad unit, but we wanted to reinvent how it works for the tablet's more deep, immersive experience," says CEO and co-founder David Bennahum.