You like me, you really like me!
Listen, I owe you all a big apology. An instant message exchange with Cameron made me aware that MT was eating comments that weren't really spam -- it turns up that I'd turned up its aggression towards comments just a tad too high.
Looking back over my junk mail cache, I realize that it's trapped a good two dozen or more messages since mid-February, when I cranked it up higher to combat an onslaught of spam. So I went through as best I could and moved them back to where they belong, then cranked the setting down a couple of notches.
So, sorry about that. If I'd known before now, I would have done something about it before now. So shame on you for not speaking up earlier! (And thanks, Cameron!)