If someone replies to one of my comments using the @Martha syntax, SE kindly lets me know about it. If someone doesn't use that syntax, or replies to someone else, I'm not notified, so the only way I will read the response is if I happen to come back to the same question on my own.
There are also cases where I leave comments suggesting an improvement or clarification. If the author makes the suggested changes but doesn't leave a reply-comment of his own, again, I have to come back to the question on my own.
Is there a way to list questions or answers I have commented on? I know the whole commenting interface is a bit of an afterthought/stepchild, but I still think this would be a useful function.