Late last year, the folks at Time Inc. assembled a demo of an interactive Sports Illustrated issue on a tablet that looks an awful lot like an iPad. If realized, this new form of media could become a "killer app" for the new device and also salvage the ailing periodicals business. Rumors are that Steve Jobs and company are huddling with newspaper and magazine publishers right now, trying to cut deals, presumably for subscriptions on the iPad. Will Cupertino be creating "iMags" before the tablet launches next month?