I started posting by email to rforge after loosing content on severel occasions by accidentially hitting the hyperkey on my Thinkpad (which is bound to CapsLock in connection with my Emacs keybindings).
Furthermore I like to post in plain html and the html formular in wordpress is quite tiny. Maybe I have just not found out yet how to get it bigger, maybe even maximized as the WYSIWYG wordpress editor, but using email is ok for me.
After enableing a secret email address for this purpose (Dashboard > My Blogs > Enable) you need to know the shortcodes to embedd categories and tags for the post into the email:
[delay +1 hour]
[comments on | off]
[status publish | pending | draft]
[title Your post title]
[end] – everything after this shortcode is ignored (i.e. signatures)