I'm running a new version of MT on this site right now, version 3.1 Beta. Sorry for any issues that arise during testing. I think things are working pretty smoothly at the moment. There are a few key features that y'all might be interested in.

DYNAMIC PAGES
The most prominent new feature in Movable Type 3.1 is the dynamic page functionality. This completely eliminates the need to manually rebuild your files; when you update the design of your archive templates, for example, the design of your site will immediately be updated without requiring you to rebuild.

SUBCATEGORIES
The new category management interface in 3.1 gives you fine-grained control over the organization and display of your posts.

POST SCHEDULING
Using post scheduling, you can set a time and date for your posts to appear, permitting automatic updates to your weblog even when you're away. The bummer is that this requires some server side stuff that might be difficult to implement on your host...