Just a warning for Movable Type users -- versions 2.64 and earlier (at least, don't know about later) are susceptible to database corruption problems.
We've been grappling with this on the Rocky Mountain Progressive Network site on and off for the last ten days. The system would freeze up and ultimately disallow publishing posts. Forum posts suggests the problem is widespread, and typically shows up once a site gets to relatively large numbers of posts (we're at about 3,000 posts on RMPN now).
We exported all the data (having saved it in HTML format, too), reinstalled MT, and are reimporting all the data. The reimport didn't work the first time (only about 15% of the archival data reappeared), though, so we're having to parse the data to recover.
Time consuming, and we're not sure that will work.
I presume (but don't know) that Six Apart has worked this problem out with at least the Professional version they're now selling, but freeware users beware...
We're looking at a proprietary 'blog' system made by our web partners, Creation Chamber, as an alternative. We'll keep everyone apprised...