I decided the other day to ditch WP for Movable Type, when being extremely annoyed at WP's lack of speed and it's amazing ability to fall over regularly on my server. From the offset it was easy to extract my posts out of my mySQL db, using a simple php script.
WP is simply no match for MT. WP is a very good platform to get started on, but thats about it in my opinion. MT pre-builds it's pages from cgi scripts and mySQL so it means that all the pre-processing is done in one big lump rather than whist the person is trying to view the page, slowing WP down.
Even if WP-cache enabled and homepage caching, it simply isn't as good as MT. So, I hope you like the theme, as I'm going to be chopping and changing it from time to time.