This looks fantastic. Kudos!

Projects like this give me hope that the holy grail will soon be within reach: an iPython-like notebook that allows me to host both Python code, R-code, and possibly JavaScript in one complete package (maybe including Sage analysis, too).

And, when the data sets are small enough, I should be able to compile all of the interactivity features of the notebook into straight JavaScript with embedded data, so that it may be run on any generic web server, such as an internal corporate intranet server.

Am I too greedy?