Byword (US$9.99 Mac, $2.99 iOS) is a simple text editor of the full-screen, "distraction-free" ilk from Metaclassy. Version 2.0 is now available, with some very nice changes, including one-click blog publishing.
Byword 2.0 for Mac introduces publishing. This is a "premium feature" that requires a one-time purchase. The app is a free update, while publishing services are available as a separate in-app purchase of US$4.99.
With Byword 2 for Mac, you can publish your writing directly to WordPress, Tumblr, Blogger, Evernote or Scriptogram. This is such a great feature that's saved me a lot of time. I like to write long posts in Byword using Markdown. Byword has been friendly with Markdown since version 1.2, so no problem there. Until now, I'd write a post and then select Copy HTML from the Edit menu. The next step was to open a web browser and then navigate to my WordPress installation and paste the HTML that Byword had placed on my clipboard. No more.