Should corporate blogs allow trackbacks? You might say no when you read the laundry list of negative trackbacks on Movable Type's post about licensing terms for their Developer Edition. This is transparency at its finest: how many companies are willing to be open enough to allow feedback from customers that the entire world can see?
In my opinion, transparency is a great thing, but it takes a lot of courage. Companies need to remember that negative word of mouth is going to happen anyway. It reminds me of individuals who don't take constructive criticism well, so people end up talking about them behind their backs. Mature people -- and companies -- are open to hearing the good, the bad and the ugly so they have the opportunity to learn and grow.
Transparency tools like trackbacks & comments allow companies to engage in a dialog. I'd expect to see some follow-up posts from Movable Type along the lines of, "Hey, we heard you; thanks for the feedback. And here's what we're going to do about it." Even if they don't plan to change their pricing, they at least have the opportunity to address customer concerns. If I had the choice, I'd rather work with an open company like Movable Type than a company who doesn't want to hear what I have to say.