Drophost
The basic idea is that the user uploads a script to his hosting server, logins with his dropbox credentials, at which point a new custom folder is created in the dropbox directory which represents the htdocs of the host.
From this point on files are basically either PHP, HTML, or Markdown files, and any changes to the local files will be reflected right away on the host where the script was installed.
It's intended to be a sort of replacement to Drupal/Wordpress and other CMS software designed for developers and hackers - I don't want to be bothered with installing various scripts, running through a UI whenever I want to upload a file or a new post in my blog/site, and I'd prefer to simply manage my site as if it was a local file system, no databases (well, maybe a little SQLite), a basic caching system (after parsing the files, we want to store them in some form that will not rape the server every time a new visitor arrives), and something that can be easily extendable.