Hello Andy Stratton,
This looks neat and I believe it answers almost all the basic queries regarding Blockly Development. However, I will be interested if there’s an interactive version. You might want to look at Gitbook <
http://gitbookio.gitbooks.io/javascript/ >.
Additionally, contributing to a gitbook publication is easy since, it provides a very good integration with Github.
Let me know if you need any help in this regard.
Again, thanks for building such a great resource :)
Cheers!
Adwait