Example of how to implement a view-based source list (NSOutlineView) using Cocoa Bindings?

Has anybody found a clear, concise example or guide on how to implement a source list using the view-based NSOutlineView introduced in Lion? I've looked at Apple's example project, but without any sense of direction or explanation, I'm finding it difficult to grasp the concept of exactly how they work.

I know how to use the excellent PXSourceList as a fallback, but would really like to start using view-based source lists instead if at all possible.