I have an affinity for python, but I work in a .NET environment, so I was looking into Iron Python, and wondering what it would be used for.  
Could you write an app in it? or is it for adding a scripting language to your app?
How do you guys use it?
My experience of IronPython is usage it as part of engine that can be changed after installation of base .Net application.
With help of Python we have described really large set of business rules, that can be changed from two system installation. Partially IronPython was used as plugin language.
The difference from script language - that after compilation IronPython executed as CLR code.
Iron Python : what are good uses for Iron Python