My interest in this comes from wanting to build Objective-C based OSX-UIs using scripting languages that are only embeddable in C, like Lua. When (if?) that day comes, I'll be like a kid in a candy store all over again.
I would recommend you to try CodeFlow from celedev [1], it's a dynamically generated Lua binding to Objective-C. Plus a nice editor with hot reloading support and other cool features.