What for is this all?
Often you need to do some UI mockups quickly. However tinkering with cumbersome UI wireframes applications or with Photoshop layers is rarely satisfying.
iPad Sketchbook is a convenient sketchbook which allows you to think out UI and draw sketches in few minutes without constantly staring on the screen.
Sketchbook sheets have the layout of iPad in actual size printed on the front. iPad screen is covered with grid which allows to lay out interface elements conveniently. On the back sheets are just covered with simple square grid for comments, various thoughts, design of individual elements, etc.