I agree...don't get much milage from MTV, but it's still a joke on the MTV side. I don't blame D* for getting the shaft here...in fact I believe that D* and it's customers are getting the shaft from Viacom here.
You know, it makes me wonder. IANAL, and don't even pretend to understand carriage contracts, but at what point do you call it a day? I guess the real metric is in the viewing numbers. If a significant number of viewers stop watching Viacom networks because of a lack of HD programming (or decent upscaling of SD content), does D* have the ability to apply some pressure to Viacom? What's the threshold of pain Viacom is willing to endure? I'm afraid we'll probably never have these answers, so it's a moot point and we'll just go on kvetching about it.
FWIW, on that "other" forum dedicated to satellite TV, there's a thread talking about Comedy Central going HD in January 2009. (It may have even been talked about here, I admit I haven't searched for it). But there's no linkage to an announcement of any kind, so I place a very low level of confidence in that info.