I also deployed my own version of theThis is a great, fully-featured online Markdown editor used in StackExchange, together with a syntax highlighting library. Features include:
That way I can write my mail content, click "Select All", highlight the code if necessary, and then paste to Gmail.
- Import/Export
- Sharing
- HTML to Markdown
- Various syntax highlighting themes
- Document management
http://homepage.univie.ac.at/werner.robitza/markdown/

