If you have a windows phone 7 this is probably the most interesting app so far (especially for any techs/devs). A scripting environment within the phone itself that enables you to run a limited number of operations, samples include finding all songs shorter than 3 minutes, simple drawing functions and a selection of more random functions. Available for download now! For more information visit the Microsoft Research TouchStudio page found here:
This is probably the most innovative app I have seen on any phone platform so far.