Seems to be a Movable Type bug here

It looks as if Movable Type doesn’t extend the “Entries” column all the way down, so the various navigation stuff on the right hand side wraps under the entries in a ugly fashion. Presumably once I get enough content into this, the problem will go away. Of course I could always learn CSS and fix it: I’m going to have to do so in order to get a nicer banner and some custom links.