This script checks the YAML-frontmatter of posts living in a Dropbox-directory. If it finds a post which is marked as published:true and which date: is in the past, it starts to build the blog, in this case instant-thinking.de and publishes it to the web via rsync. This should work with other Octopress-blogs too.
I'll write a blogpost with further details and link to it here in the near future...