Check out https://readthedocs.org/ which is directly related to writethedocs.org. Here's a bit more instruction on how they're building up a repository of these docs: https://docs.readthedocs.org/en/latest/index.html
It isn't so much about how to write documentation, but adding that section is something we want to do.
We also have a section currently linked to a couple of interesting projects: http://docs.writethedocs.org/en/latest/about/alternatives.ht...