I've been blogging on the Posteorus platform for about a month and its worked OK. It is able to quickly turn emails into blog posts, so it does the basic job effectively. However, it is missing many features, such as the ability to add useful widgets to the side of the blog. In addition, Gmail does not make the best text editor, since its also a bit oversimplified. For example, its missing basic formatting options that exist in other programs.
Today, Posteorus just launched a new focus on being a kind of social network and photo-sharing site. The blogging platform will still exist, but they will no longer be focused on blogs. So I guess I won't be able to expect any blogging platform imptovement. I wish them luck, but I will probably move this blog to WordPress soon.