I like!

One thing that I am hoping for however is some kind of notebook-like interface for doing small, ad-hoc data analysis projects. This looks fairly close to that.

Mathematica pioneered "the computational notebook" concept, and now we have similar stuff with R/Rstudio, IPython/Jupyter, matlab, and jmp. Those are all really nice and powerful, but they're somewhat large in scope and very ambitious.

It would be soooo cool to be able to just make notebooks that contain spreadsheets, related manipulation and analysis code and also text that can render to well-formatted html/pdf documents with really nice tables.

This tool looks like it can get there... if it can develop the ability to render documents sort of like Knitr for R.