What an excellent development tool. It makes iteration very easy - especially if you are going pandas type development.
Not sure why - but I seem to have lost the ability to save my Notebook as an RST or PDF file. This may be due to the amount of instances of python and machines I have been working on recently. But no problem there is a nice solution.
ipython nbconvert --to rst Update-Group.ipynb
And this will produce an RST file which - incidently is how I update this web site.