I'm currently using SimpleComments on all of my blogs, because I like being able to treat trackbacks as "remote comments." However, given that my courseware blog will be generating lots of comments (I'm posting discussion questions there, and I've got 34 students in the class), I'm thinking that ThreadedComments would be more valuable.
It appears, based on the documentation of MTThreadedComments, that the two plug-ins together. But I'm going to attempt the integration here first, rather than risking my now in-production class blog. If you run into problems here today with adding comments, be patient. I'm working on it.
It seems my hosting provider (WebIntellects) doesn't have the "patch" command available, which means I can't install the ThreadedComments on that server. Guess I"ll have to do an MT install on my PowerBook and play there before I do anything else. <sigh>