Good news, everyone! About a week ago https://www.dartdocs.org
was relaunched with the new infrastructure, and now it generates documentation with the latest 'dartdoc'. Also, the documentation for all the existing packages was also regenerated with the latest 'dartdoc'. So, please try it out!
I'll try to write a blogpost about the infrastructure of dartdocs.org
later, praising Dart concurrency support, which allowed me to build it in quick and efficient manner. :)