It's no secret that RIM's PlayBook is going to need a connection to a nearby BlackBerry phone to do much of its corporate heavy lifting, and a new video posted by the company today shows a little more detail on exactly how that'll look. The one-minute, 54-second spot spends much of its time in the tablet's email app, demonstrating how the Playbook and the Torch beside it are perfectly in sync -- read an email on one, it immediately shows read on the other, and so on. We also learn that any secured corporate data that you're using on the PlayBook while tethered is essentially on loan -- it'll disappe
