This tutorial looks quite well done.
Wintersmith tries not to put any limitations on how you work with your content. You can transform it using plugins and structure it as you please.
No special directories or odd metadatafiles, just a directory structure. This means that you can simply throw in your old hand-crafted static site or content from other generators.
Use your favorite templating engine, it comes bundled with a Jade plugin and there is community made plugins for most other node.js templating engines.
Wintersmith also ships with some handy site templates for building blogs & webapps.