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?
We use it as an embedded language inside of our software.
I had an article on my blog, but recently switched to a new system. You can find an archived version (with broken image links) here:
Our field engineers now use the embedded language to test things on the fly,
our quality assurance people use it to create small scripts to test all features of the hardware, etc....
Hope this helps.
Iron Python : what are good uses for Iron Python