So I don't forget it while I braindump in two other posts: my hypothetical "(N words)" MT plugin should look for <ins/> and <del/> tags and parse their datetime attributes, so it could also say "(N words; last updated I:J X/Y/Z)". That or just read the post's modified_on date, but I like the idea of using what's in HTML better.
Plus a "tail Activity Log" widget for MT. It should be pony-compliant. Wah, if only I could make enough money from all these tiny gadgets to... like... hire people to make them.