Playing around with Moveable Type templatating and customization for a joint project with Just. It's mostly nice and easy to use, if a little underdocumented (but when you have source that's not a problem). Two annoyances:
The CMS is not really a moveable type application. It uses a different templating system than the weblogs for reasons that aren't clear to me. It is also difficult to extend/modify the CMS, since it uses some huge subs to generate the pages in what looks to me like a very circumstantial (if code line efficient) way. A bit of a shame. MT could be even more interesting if the CMS could be modified easily also. The problem I was trying to work was adding more fields to entry posts, and changing the wa one specifies categories.