I hack my blogs a lot and thus I participate in several Movable Type developer lists. (It’s also why I turned down a offer to join ScienceBlogs way back when.) Since yesterday we’ve been discussing whether to try to standardize the MT plugin community on a single javascript API to improve plugin compatibility and code reuse. A majority appear to agree that standardizing would be a good thing; however, we’re not sure which library to pick. I use Prototype myself, but I think that the best argument is being made for jQuery. YUI has several people in favor of it including some at Six Apart. The following two links are helpful in this discussion.
So I’m following a suggestion of Dave Munger and conducting a poll on this topic.
So if you are an administrator or developer of movable type, please weigh in. You can also discuss it in the comments.


I think you need a “Yes, standardize, but I can offer no insight on the best choice” option. That’s what I’d pick!
I figure ‘None of the above’ covers that.
Update