So RStudio in a browser? Jokes aside, this looks great. The biggest frustration I've had with the notebooks is the organization of code. Nice to see that become a bit more compartmentalized from the execution window.
Totally agree. My larger notebooks get pretty ugly and I have to spend a fair bit of time cleaning them up. But that's probably because I am not the most organized person ever.
That is why it is better to keep a jupyter terminal or qtconsole around for quick and messy experimentation connected to the same kernel before pushing it to notebook
As a non-professional user, I really like the existing everything-in-the-same-space-like-a-textbook-but-of-course-you-can-hide-libraries-and-modules layout. Is it still there somewhere?