Many users like their WYSIWYG text editors (even though they are often problematic between older browser versions or with "paste-from-word" or conflicts with other JS-includes). And the expectations are rising - one customer of ours would like a WYSIWYG-editor "with Apple style interface" in the browser, with all the bell's and whistles of a full blown publishing solution including complete layout control, input validation, CMS support and so on. The old TinyMCE fields of his legacy app will no longer cut it.
Meanwhile, I write the documentation for my software in Markdown, because it is the fastest way for me to get structured text from my mind to my machine. And with the help of pandoc, it's convertible into all other text formats, from HTML to PDF and LaTeX etc. (Although the html-with-images to PDF support of wkhtmltopdf is even better, so it's Markdown => pandoc[for HTML] + wkthmltopdf [for HTML to PDF]).
Meanwhile, I write the documentation for my software in Markdown, because it is the fastest way for me to get structured text from my mind to my machine. And with the help of pandoc, it's convertible into all other text formats, from HTML to PDF and LaTeX etc. (Although the html-with-images to PDF support of wkhtmltopdf is even better, so it's Markdown => pandoc[for HTML] + wkthmltopdf [for HTML to PDF]).