Perhaps creating a command line interface for Tumblr / Posterous hosting would work. I wouldn't try to reinvent the hosting platform though, if that's what you're asking.
Hosting one's own blog is trivial, and I'm willing to bet that your target audience is more likely to use a static site generator like Jekyll or Pelican.
Hosting one's own blog is trivial, and I'm willing to bet that your target audience is more likely to use a static site generator like Jekyll or Pelican.