@kylnew This looks great! Really inline with everything we're doing with IndieWebCamp (http://indiewebcamp.com/principles) The app looks really well designed, I'm impressed!
We've been making progress on a way to sign in to apps like this using your own domain, where the app can then discover the posting endpoint. I'd love to chat more about this! I'm in the #indiewebcamp IRC channel on freenode.net if you'd like to chat! http://indiewebcamp.com/IRC