Yet-Another-New-Experimental-Not-Officially-Supported feature — http://blog.case.edu/comments. Track the newest comments made on the Case blogging system. You can break it down by commenter according to his or her email address:
Keying in via email address comes with two problems. 1) Users have multiple addresses. 2) There is no guarantee that the user posting under email@example.com is actually me. But, it may be of slight use to some; so go ahead and play with it if you would like. Send email if you have any feedback.
And, of course, you can subscribe to those URLs in your favorite news aggregator in case you want to track all of the comments someone makes on the system.