HTML5 Starter Template
There is new theme added to Blogifier that has only two purposes in life - to provide clean, easiest possible HTML5 template for building your own theme from scratch and to run optimization tests. It is a bit ugly and simplistic, so I don't expect anyone using it for a site without customization.
Speaking about themes in general, I think it would be best to have a variety ranging from as simple as this one to pretty complex and multimedia rich - like Philosophy and Vizew. I think Blogifier close to having good set of built-in themes to choose from, maybe couple more to come but really close to be done in this department.