I keep seeing a small problem with comments on answers and questions on SO.
Firstly, there are two types of comments, the ones that stand as individual snippets, these are usually humerous or factual. It makes sense to display the highest rated comments first as they don't usual lose semantics when displayed on their own in relation to the question/answer.
The second type is a discussion based comment, or comment response. These flow like a traditional forum thread. You will often see the format of:
I think this is a silly answer! - User1 +0 @User1, you are wrong because... - User2 +9 @User1, I also think you are wrong - User3 +21 Actually I am right because... - User1 +45
These would be displayed in highest rated first order, with other comments hidden. They lose all their semantic meaning at a glance until the thread is expanded and they all shuffle about. So they might as well not be shown at all until they are put in the full context of the other comments.
This doesn't make much sense to me, and there must be a better way of displaying them when some are hidden. Perhaps on wiki answers they should be displayed chronologically always as those sorts of questions are more likely to produce discussion based comments? I don't know, just some ideas.