I think it would be a nice feature if the user that asked the question would be visually indicated when they add follow up post and comments. In my mind the user that asked the question has a special place or 'more significance' than other users.
For example on this question I asked the question. So, if I post an answer or message for this question, then add some type of indication to the post or name. A 'visual indication' could be anything such as a 'star' next to the name, some type of subtle highlighting.
Currently when I read a question on Stack Overflow I have to note the user that asked the question. I don't always succeed at doing this.
