I've finally given up on Movable Type. It's done well for me over the years but I was starting to see its limitations with page builds starting to give errors and taking longer and longer to build a new page.
With that, i've moved to a custom-built CakePHP backend. It's nothing fancy at the moment, as I really just wanted to duplicate what I had before but now that its in place, it should give me much more flexibility to do what I want with this site. Luckily, I was able to retain my entire URL structure, so there should be no 404s as a result of the transition (although, if you run into any, be sure to let me know).
A nice bonus is that I've built theming into the system to more readily allow me to roll out new designs but also to allow you, the user, to select a theme that you prefer. At the bottom of the sidebar, you can select to switch between version 5 (previously called version 4 but that's a bit of a story) and version 6. Some day, you may even see a version 7.
There are still some rough edges. I didn't put the Gravatars back in but I think I will. Some of the styles in the old version also need to be cleaned up. In any case, I'll get around to that eventually. Hopefully nothing major is broken!