I’m caught in the same quandary. I had invested quite a bit of time going down the path of multiple installs on one domain, then learned about MU.
I can’t really see that MU does what I want it to do – but I am totally a novice at this. It appears that MU is great for letting users create their own blog that is administered centrally. That isn’t quite what I’m looking for. I want to directly administer blogs on related topics where the Authors can publish only to certain sites (but read all of them.)
I hope someone can come along and answer this…