Having written about Ruby in the scope of the Compiler Dev Lab and the Dual Schema Problem, I was interested to come across the Ruby.NET project from Queensland University of Technology. From the Ruby.NET home page:
Our goal is to create a compiler for the Ruby language that targets the .NET CLR. We aim to support 100% of Ruby language semantics, including all dynamic constructs such as closures and continuations. We plan to generate 100% managed and verifiable CIL code.