I'm sure you've all heard of Autodesk FormIt by now - The new tablet based geometry creation application for designers. FormIt is the first 3D modeling tablet app aimed primarily at the AEC industry. if you haven't already seen FormIt in action you should check out the video below, but in short: It's a cut down version of Vasari with simple geometry tools (extrusions/voids) which are fully controllable via a touchscreen with your fingertips!