I'm working on an new Plugin for the Bludit CMS, which allows you to create sub-blogs (multi blogs), it supports multilang posts (posts, pages and categories in multi languages) and you can also have an eshop.
Regardless of the Bludit's flat file system, you'll always need caching in some form. So, what are some of the other benefits of caching?
If you have installed Bludit as the blog system of your choice, and now you have decided that it is time to move to WordPress, here is a converter for you.
Colibri CMS is a project I am working on.