Which usernames do you recognise?
anigbrowl: Do you mean as individuals outside of HN, or as people particularly worth reading here? If the latter, there's maybe 20 or 30 people whose name will make me stop and read something I might otherwise skip. But I tend to see the comment first and afterwards note 'oh, xxxxx again, of course' My favorites are those with whom I have constructive disagreements, or who'll take time to tell me why I'm wrong about something.