Touch Studio for Windows Phone 7

Write and execute code on the phone. Pretty neat. [Link]

In this video, Nikolai Tillmann and Michal Moskal, from the Research in Software Engineering group (RiSE) at Microsoft Research, present a new Windows Phone 7 application: TouchStudio. TouchStudio is a radically new Windows Phone software development environment, bringing the excitement of the first programmable personal computers to the phone. Now you can write code for your phone on your phone!