Either way. For long-term interactions with someone, the idiomatic way to do it is to grant them access via either a DW account or OpenID (or equivalent). But for someone that shows up making interesting comments and getting into a good discussion, you don't want to put the brakes on that more than necessary by having to unscreen every comment.

Part of me wonders if this would tie into plans to have anon users give a pseudonym rather than just all be "anon".