Zine is an open source personal publishing platform written in python. it's written with security and extensibility in mind and inherits many ideas of wordpress and other existing blogging systems.
* basic blog functionality: posting, comments, categories, tags, and atom
* user, group and permission management
* theming support
* importers for wordpress and blogger.com blogs as well as atom feeds.
* an advanced plugin system
* a translatable interface
* pingback support