Gregory J. Smith wrote in to announce the availability of an AppleScript that will help you migrate your MT entries into a Blosxom blog. You can read about it here and download the script locally here (I merely copy/pasted Gregory's text into AppleScript, so I make no warranty or promises!).

UPDATE. Gregory wrote to say that you can always download the latest version of the script from his site. He's also said he might have a few more to post so you can look for those, too. :)