I'm gonna try to upgrade to Movable Type 5 sometime in the next 24 hours or so.
If all goes well, y'all shouldn't see any changes or problems. If it doesn't go well, this blog and Vardibidian's may be offline for a while, until I can fix whatever's broke.
(This is why I haven't fixed the broken commenting system on my blog. I shut comments down entirely for a little while, then when I turned them back on, it didn't allow non-signed-in commenters. I figured since I was going to upgrade to MT5 in a week, it wasn't worth the hassle of trying to figure out how to re-enable comments.)