While range limitations and bandwidth constraints of smartphones and tablets prevent full-blown CAD, CAE, or other design tool work, new mobile apps are emerging to help engineers be more productive.
Technical calculators, 3D mark-up and viewing capabilities, and a variety of highly specialized engineering utilities are now commonplace on app stores for both Apple's iOS devices and the wide variety of Android gear. There are even some base simulation capabilities being made available in app-sized packages, and there will be lots more to come as design tool vendors and engineers figure out what functionality makes sense in this new paradigm.
Click on the photo below to view a slideshow showcasing the mobile design apps available today:
Autodesk's SketchBook Mobile is a professional-grade paint and drawing application designed for the iPhone and iPod Touch.