From the Markdown website:-
Markdown is a text-to-HTML conversion tool for web writers. Markdown allows you to write using an easy-to-read, easy-to-write plain text format, then convert it to structurally valid XHTML (or HTML).
I've taken to using it wherever I can, including content generation for this site, with these useful set of tools:-
- Marked: markdown preview application for OSX.
- nvAlt: used in conjunction with Marked for super-charged note taking.
- Markdown editor plugin for Eclipse.