NSDuctTape is a new library for writing Mac OS applications using the .NET framework. It is designed to allow models and views to be defined as .NET classes that can be accessed by interfaces defined with Apple's Interface Builder or from arbitrary Objective C code.
The download includes the source for the library itself, as well as a sample application, CurrencyConverter, which is based off of an Apple tutorial, but the "guts" of the application have been implemented using C#. I intend to post a brief tutorial soon.
Questions, comments, and snide remarks (and patches!) are quite welcome. The library is still in an early phase of development, but it should be usable for many tasks, and it is my hope that it will be clear how to extend the library to cover cases for which it is not yet suitable.
What are you waiting for? Go download it, already!