TouchDevelop makes learning programming exciting! You can write code directly on any device and you can directly use sensors and media via high-level APIs. It’s easy to create games and apps, publish them or tweak those published by others. You write code in our touch-friendly editor where you compose programs by tapping on your screen, yet concepts you learn transfer to traditional languages such as Java or C#. TouchDevelop embraces the “Bring Your Own Device” revolution by providing a unified programming environment everywhere.
via TouchDevelop.