i think it would be cool if unreplied to or un-checked comments left on your profile have a red "!" next to it with a 16 pointed star or something..you know would be good,especially for you mods who leave and cant remember which reply you read last.
you dont have to,or you could check a box saying youve read the comment..it will be helpful with mods knowing they get what? 4 comments every couple of seconds saying "Your the bst!" and she eaves comes back and sees them and she cant see which one was last left..see?
Well there is no way of knowing if a person has read their comment unless they check it off themselves. But the idea of a little flag that toggles on and off for what you have read is nice. And a little announcement saying you haven't read # comments.