David, the sneaky sneakster, upgraded the beta blog to MT3.16, and I'm at the "tweaking templates to look right with the new stylesheet" stage. Still some archive templates to be fixed so they display the new banner image and colors. I will be going through all the templates looking for inconsistencies that may be lurking there from my old installation, but I'm pleased that the latest version is a new commitment to quality (and bugfixes).
UPDATE: as previously stated, I've got some template tweaks to do. And the cool crap is getting cut way, way back. The banner image is working and is pretty close to its final design. I'll have Typekey authentication enabled, and non-Typekey comments will be moderated (not likely to be a problem with the very low number of "real" comments I get). I may check out the new spamkilla on the block, too.