There’s a Ruby package called RubyCLR. With it, you can write Ruby code that uses .NET assemblies.
It looks pretty amazing. Charlie Poole has a post on how to use it to run NUnit tests from Ruby, and he has code samples. It’s just like using Ruby classes, except they’re written in .NET. All you need to do is reference the assemblies; the rest is just magic.
Imagine writing a Ruby app that shows a WinForms GUI. Wow.
As Brian just said while looking over my shoulder, “This will have to be played around with.”