Syntax highlighting, divide screen into multiple edit panes
Purist design with a focus on simplicity and usability
Built in preview for Markdown and HTML
Free-form 'canvas' mode great for note-taking, to-do lists, highlighting, custom layouts
Popular and fun themes included, plus the ability to create your own
Theme selector lets you easily switch between different visual themes
Ctrl-h brings up the help window with keyboard commands and full documentation