Today Byword 2.0 for iOS was released, and though I am not a Byword user it has one major new feature that makes the app a serious contender for my usage: publishing. Available as a $4.99 in-app purchase you can now publish directly to places like Tumblr and WordPress.
This is a great addition and something I very much hope more apps start to support.
Update: I missed this at first, but the Mac app got the same publishing treatment. Very nice.