I have a NNTP, although so far nobody joined (except for a few testing messages, and some of my own stuff) and nobody mirrored it onto their own servers (although I haven't yet implement the ability to forward from my computer, and IHAVE currently isn't enabled on my service; I can fix this though if people will want it in future). There has also been the suggestion to also include a web interface to configure and operate it for users who use web interfaces, as well as having the NNTP service for users who use NNTP. There is also the idea to support Markdown, which I also think is helpful, although there are two considerations that must be made: (1) Only articles with a "Content-type: text/markdown" header should be interpreted as Markdown; otherwise, it might mess up a display due to using things that isn't supposed to do. (2) It might be helpful to use a subset of Markdown without HTML features, to make it more readable even if you do not have Markdown on your computer.