This is technically "project 0" of the Udacity Data Science Nanodegree course, but I decided to go back and spend time completing it anyway even though they added it after I had already completed the first project.
It showed me how IPython Notebooks worked, was a quick/simple little demo of how to use them.
Open the HTML file, which is an export from the .ipynb file.
You'll need Python 2.7 installed on your system.
Download the .ipynb file, and run ipython notebook Data_Analyst_ND_Project0.ipynb
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This will open up a web browser and you can see the notebook and edit it yourself.