Simon,
Now that April has arrived, and my schedule has opened up, I am confirming my ability to now help with the cookbook.
The first thing I am thinking to work on is updating my article on tags to make it more accessible to beginners. Specifically, the tags article has examples of Halloween candy received being counted as income. While this is creative (IMHO), I would like to find something that doesn't stretch the mind quite so much.
The second thing is to make any additional updates to the above article. Specifically, I understand hledger 1.25 has some new tag features. Once Brew will let me upgrade my Mac version to 1.25, I can tackle this second part.
Rob