This is ScratchBook.
Designed for the tablet, it is a simple sketching app that gives you the power to quickly sketch your ideas and then share your vision with other people to bring ideas to life.
There are no layers, no pixel sizes, no stencils, no fancy color palettes. ScratchBook was designed with the idea to provide users with only the most effective tools to get things started, fast.
You can share your sketches via 37Signals Campfire, E-mail, Bluetooth, DropBox, Twitter, Facebook, and Evernote.