jq is such an underrated tool, it is fully turing complete functional language in and of itself. It opens up an ocean of possibilities in combination with scripting languages (python has bindings), and it is ungodly fast chewing up through tons of JSON like its nothing.

It is a bit perl-ish, but being pure and functional it is a little easier to reason about when you have to revisit your queries.

PS I am certainly bookmarking your tool as well =]

There is also amusing project jqjq that implements jq in jq itself that I love to point folks at to show how expressive the language is: https://github.com/wader/jqjq