Paul Mayne, developer of the popular journaling app Day One, teased/introduced a new feature coming to Day One in the future with a tweet linking to this page. Shortly after that, a tweet from the Day One account (Pre-)Introduced Publish by Day One.
Publish lets you (or will in the future) share your entries from your Day One journal, and you'll be able to create a beautiful and responsive webpage containing everything you can put in an entry.
While this is a really nice feature for easily creating a good looking site to share some words, pictures, things you wanted to share with the world, I wouldn't really want to share the things I'm writing in Day One with everyone. Chris Gonzales feels the same way I do:
"Although I probably wouldn't publish any of my entries in their current state—mainly because I don't edit them very vigorously—some of them do contain the nuggets of ideas that end up on Unretrofied. I can imagine that other people who put more effort into their entries are going to publish some excellent stuff."
I really like the way the pages look though and could think of some things to share that way. It's something I'd need to integrate/change in my workflow (and maybe separate with a tag in Day One), but I'm really looking forward to it.