Promoguy's got a nice MT hack that sends you more specific info in the subject line of your comment notifications. And another one that gives you that info for trackback notifications. Neato!!
(ie. Instead of getting emails with subject lines that say "[PromoGuy dot Net] New TrackBack Ping", you'll get: "New TrackBack on [My Mouth Is Doing the Happy Dance] from [PromoGuy dot Net]", well, heh, only if you have that for your post title. 😉