You might not notice it, but this is the first post written on the 3.0 version of WordPress. The fact that you’re not noticing, is testimony for how smooth the upgrade went. Obviously I didn’t upgrade to keep the exact same blog. There are some big enhancements that will enable a bunch of ideas I’ve been wanting to implement.
It’s now possible (or at least, much easier) to customize how individual posts are displayed. You can define custom post types with a dedicated custom template. Or you can keep it a little easier with custom backgrounds and headers. It’s a feature you’re probably going to see here pretty soon.
There are also an extreme number of enhancements for developing themes and plugins. The list is so long, I’m going to have to take a day just to go through it and see what I might want to use.