Within the discussion areas I get notified by email when someone replies to a comment I made. However, if I reply to Bob's comment and Joe wants to reply to what I said then he must reply to Bob as well. The problem is that Bob gets an email and knows that Joe replied to what I said but I have no idea.
It would be nice to know when people respond to a discussion I am in the middle of instead of just the ones I began. Basically what Facebook does when you comment on a status, all the people that comment on that status afterwards will then be emailed and they offer the ability to turn this on and off.