Fabrice Niessen has a couple of beautiful Org mode HTML themes that lets you produce lovely and functional Web pages by exporting normal Org mode files to HTML. Currently there are two themes. The first, Bigblow, is a general theme for Org documents. It does the same sort of thing that exporting to the default theme does but has much more functionality and produces beautiful output. Niessen has a demo of the theme in action that will give you a good idea of its capabilities.
The second theme, ReadTheOrg, is a clone of the Sphinx theme used by the Read The Docs site. It’s perfect for producing HTML documentation.
Niessen has a useful refcard that explains how to use the themes with Org mode. It’s mostly the usual Org mode objects but there are a few other commands to generate special notation for things like notes and warnings.
These themes and Katherine Cox-Buday’s post on exporting to PDF show that Org mode provides a publishing platform that is much more flexible than it might appear. The default output is very nice and usable as it stands but with a little CSS or documentclass work you can produce beautiful documents that are the equal of any other documents—at least any other documents that are digitally produced.