From Posterous (and most other blog platforms), I find one thing conspicuously missing: love of the comment. Posterous leverages the power of rich formatting in email clients, which has been under development for far longer than the rich editing tools of blogging platforms, to make posting both easy and powerful, but does not extend this same utility to commenting. Indeed, commenting seems to have no rich formatting tools at all (not verified). Posterous has introduced the ability to reply to a comment on your own blog via email (Introducing commenting via email), I would like to see this taken a step further to allow other (logged-in) users to comment via email too!