I am curious to do what happens when you edit a post on this site.
I am using wmd for my markdown editor, of course when I goto edit, I get the HTML it generated not
If you want to convert HTML to Markdown in batch, I can recommend Aaron Swartz’s html2text.py Python script with which you can just:
cat my.html | python html2text.py # outputs markdown
Edit 05/11/12: Nowadays I use Pandoc which is like a swiss-knife for text documents. Can convert html<>textile<>markdown<>epub<>pdf<>latex, etc.