Well, I believe all applications should be scriptable so anyone can improve its behaviour to adapt to each one’s usage.
Crack.NET is a kind of inspector for .NET-based apps (Winforms and WPF) that also allows you to write IronPython code, scripting any application. Both IronPython and IronRuby are perfect for this kind of job, and if you are doing .NET development, please consider providing a scripting interface in any of these languages. I’m sure your advanced users will improve their workflow, and even give you ideas for some new features!
By the way, IronRuby official repo is now on GitHub!