I moved all of my old posts (like all five of them or something, complete with spelling mistakes) over to the movabletype system. One thing that I found is that it isn't completely easy to add php to a post because every carriage return in the PHP gets convereted to an html break, which throws errors in the PHP (did that make sense?). So, I had to do some man handling to get it to work. Maybe in a newer version, they'll check for the PHP opening tag and then not do anything inside there, if I can find a way to explain it that doesn't sound like I'm babbling...