I use plone, which is not technically a blogging software, more a full-fledged Content Management System. I have blog-like articles but I also can integrate easily other features like newsletter, forums etc within the same framework. It's a little more complex to use and develop than other apps, but IMO it's well worth it.
Besides, it's free/open source software (GPL). And it's written in python, which adds to the coolness factor... so Plone should be among the poll options
Plone homepage:
Plone