This is a meta-issue to list, discuss and shake out ideas for improvements to the notebook. It can serve as a central page for users to propose ideas and discuss them; as they get more fleshed out and there's a chance of implementing one of them, we can make a separate issue (or pull request, if there's code) for it.

In our docs we already have some items noted, so that list should be used as a starting point for the discussion.