I remember reading a while ago that YC founders' posts appear in a different color to other YC founders. Is this still true? If so, that's sort of an in-built voting ring.
Still true. But AFAICT such voting-ring impact as it has is canceled by HN's anti-voting-ring software, which treats everyone the same.
By the way, when pg added that feature years ago, he actually added two features: the colored usernames, plus a page for stories submitted by YC founders. The latter really did have a voting ring effect, and when we figured that out we got rid of it.