Beyond the Blog walks through the modification of MovableType for use in managing entire sites. Boxes and Arrows is a prime example of an entire website powered by MT.

This is very interesting to me, because I've been searching high and low for a free, lightweight, usable Content Management System (CMS) for but all my experimentation and evaluation has turned up naught. Perhaps it would be good for me to do a little under-the-hood tweaking of MT myself.