I often find that postings voted little nonetheless sometimes come with a lively and up-voted discussion.
The listing of postings shows the karma of the posting but gives no indication of the volume and quality of the discussion.
At least for the display of a positing it should be easy to display an additional karma score indicating the sum total of the conments. That'd give an indication of the aggregate.
This would improve awareness of positing discussions. On the other hand such a scoring might further drain away participation from topics which fail to attract discussion.
I would take it farther-- I'd like to see people get a small percentage of the karma from the discussions their posts and comments generate.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.