I've been developing a Python Content Management System for over a year. I use it to power my site at raspberryWebserver.com, and I've developed it to a point where it's ready for beta testing.
You can read about it at http://www.pyplate.com. Pyplate is much more compact than Wordpress, so it runs quite a bit faster. I've tested Pyplate with Apache on Raspbian, and on Ubuntu on a PC. Currently only Apache is supported. I will test Pyplate with Nginx within the next month.
For this stage of beta testing I need to make sure the site is accessible, and that the installation process works. I also need to make sure that the forum (http://www.pyplate.com/forum/index.php) works properly.
If you'd like to try out Pyplate, you can see how to install it here: http://www.pyplate.com/install-pyplate
Note that I recently changed the DNS settings, and it may take another 24 hours for everyone to be able to access it. I think most people will be able to access the site by now.