As pg says at the beginning of the comment, if you want to know if a particular domain is banned, just submit something and see if it's dead immediately.

FWIW, this comment and my previous one aren't a complaint: I think that most of this is a good thing. I _do_ think the mods kill some important stories, and I think the flamewar filter is terrible, but I'm glad for a lot of it, and wish there was more.