[2mur]

I think that the documentation for backbone and underscore is excellent. And the single page, annotated source code is probably even more helpful.

The thing that I wish the project had was some official opinionated best practices guidelines. How to structure a growing app, build/minify workflow, pitfalls, etc. (Note: this wish may be due to my utter noobishness and I'm mostly monitoring the mailing list and reading all the questions to learn)

Other than that, I wish AMD was going to be supported in core, but tbranyen's requirejs use (shim) plugin is going pretty well.