Hooray for knowledge!: This is good news. This used to just be for paid licensees.
With the release of 3.2, we’re making the Movable Type knowledge base completely public. (Sneak peak). Like the user manual, it is also completely powered by Movable Type and has comments enabled on every single entry.
Also good for MT information is the MT Wiki. I wrote quite a few of the first entries on this wiki, but it seems to have been shut down after it got spammed (see the bottom of this entry, for instance).
There’s still some good stuff there that’s applicable beyond MT, like some of these that I wrote (at least initially):