Ask HN: Should HN support Markdown comments?
Anyway, the audience here would probably make good use of such a feature, and comments would benefit from all the nice formatting options that people are already familiar with from Stack Overflow, GitHub, and other places on the web.
I'm not sure how HN would transition to support Markdown rendering of comments. Perhaps some problem with the transition is the only reason this hasn't been done already.
In any case, wouldn't this be a solid feature add for the site?