I've successfully converted my blog from Typo to Mephisto! It's surprisingly easy. The only note I'd make about conversion is that you actually don't have to create a new entry in the database.yml file. It's now included so you have to edit the existing file. That took all of 15 minutes for me to figure out (duh).
That also means this machine's migrated to Rails 1.2. W00t! DHH thinks I'm a wuss for not living on edge rails, but I'll live.
I need a little bit to settle into my new surroundings, but this really is quite nice. Looking forward to posting actively again!