Comments on a question are often a good indication of whether
the question is well written (a badly written question usually
gets a 'Please include some code/please expand your question'
comment almost immediately).  It would be useful (to me at
least!) to see which questions without answers have comments
(and hence are likely to be too vague to bother reading).
share|improve this question I've found that's it's the other way
around sometimes. Interesting questions that require some
clarification before answering have long comment threads. – 
JohnP May 12 '11 at 11:06 @JohnP: The maybe the number of
comments would be useful for both of us? –  Jackson Pope May 12
'11 at 11:21 I just noticed that I didn't add 'but yes, an
indicator would be useful' :) I'd actually prefer if the
indicator showed the rate of activity rather than just whether
there was activity/no activity. Maybe a color coded icon. or a
number –  JohnP May 12 '11 at 11:29 I disagree with this;
comments are and should be incidental, not essential