Two still mythical tablet devices, the Microsoft Courier and the Apple Tablet, are probably the hottest and most coveted devices that do not yet officially exist. To further fuel the anticipatory gadget lust, Gizmodo has scored an in-depth look at the formers user interface and overall design. As we were clued into by earlier leaks, the Infinite Journal is the key metaphor for Courier. Its like an enormous notebook for collecting pretty much any kind of content: clippings from the web, your own