If you are interested in modern languages you have got to get this for your Windows Phone. For a mere two pounds you get a Ruby runtime and editor which lets you create and run programs on the device itself. Let me be clear about this; it means you can create brand new programs and store and run them on your phone, without using a PC or anything else. Astonishing.
The installation comes with a bunch of programs including a Twitter client and a passable Tetris clone.
I’ve not played with Ruby much, but I’m always fancied having a go, and now I have the perfect platform. You can find out more at http://www.iron7.com/