Whoa, this is a huge, huge deal for me. This is going to make Google Docs incredibly more useful, and will provide some functionality that I've currently been working around using vim block editing and macros (hey now, vim mode is a great next project for google docs :-D). Ability to import/export as markdown will also be a game changer for less technical people who want to contribute to technical documentation. I strongly prefer technical docs to be in markdown and under version control, and that makes it hard for people. This doesn't solve the git learning curve of course, but that part is pretty manageable.

Thank you to the people who made this happen! May you continue your great work for a long time to come!