Vox by Six Apart is a fun, free, ultra simplified version of TypePad and Movable Type, blog software also developed by Six Apart. If Vox had a dashboard and some sort of traffic stats it would rank higher just on ease of use alone.

The sign up is easy and you can begin blogging immediately. There are close to 200 theme templates with color variations – you can choose your layout from four options and customize your sidebars if you like. However, none of the templates are open source.