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That is a good idea. IPython Notebook was another inspiration for Quiver. Since Quiver uses an simple JSON format for data files, it's easy to write a script to convert IPython notebooks to Quiver notebooks. I don't yet have importer scripts, but I have written some exporter scripts here, and you get the idea. https://github.com/HappenApps/Quiver/wiki/Export-Scripts
It would be cool if it executed the code like IPython as well.
I like to keep Quiver simple and lightweight. Quiver app is only 8MB unzipped, while Evernote is over 160MB unzipped.