For now I've switched over to one of the default MovableType template and stylesheet combos, since my old layout was sort of "broken" in IE 6 on Windows (actually I think it's more a matter of IE's CSS support being broken, but that's another story). The default template setup isn't perfect; it doesn't scale that well on lower screen resolutions (believe it or not, there are still people out there running their displays at 800x600), but I can live with it for the time being.
Now it's simply a matter of brushing up my CSS skills and putting together my own look and feel again.