I've spent the last couple of days doing a crude port of Leonardo over to Django including a converter from the Leonardo File System.
I apologize in advance for any problems with the new system.
Functionally, it should already be better than the old one. In particular, categories are handled in a better way which, amongst other things, means that you can navigate through all the pages in a particular category with a previous and next link (see the categories in this post for an example) and category pages list entries with a last modification date and number of comments. Also there is a path of links at the top of any page that isn't at the top level.
I still need to clean up some of the content in light of changes like this so excuse the construction work for the next few days.
Lots more new features planned though, which is one of the reasons I did the port in the first place.
The original post was in the categories: django announcements leonardo this_site but I'm still in the process of migrating categories over.