Movable Type plugin: Comment Subscribe

Comment Subscribe is a MT4 plugin that allows you to ... well, subscribe to comments. This basically sets it up so that if you're trying to track a conversation but you don't have time to keep hitting refresh on a certain post, then you're notified by email when someone posts.

Pretty useful unless you happen to give the wrong email. Then I could probably see some issues happening. In any case, definitely worth while. I've seen this implemented in a number of custom blogs, but nothing quite like it for Movable Type.