Let’s do it. I think this is an opportunity for people to help out. Anyone can create one of the template repositories (pip, conda, R) I mentioned, a base binder (like Tony mentioned, kaggle binder, ouseful binder base) or a concrete, task specific one that Chris mentioned.
We can then host them on github.com/binder-examples or link to them. Depending on what people prefer. Or even from the landing page on mybinder.org. (Direct links to working examples/how to get started was a frequent ask in the binder user survey!)