It looks like @font-face is broken in Version 1.3.3/1.3.4 of Dart and in polmyer versions 0.9.5 and 0.10.0*. The solution was to globally put the @font-face code and then use the .css file and applyAuthorStyles on each element that requires the fonts. NOTE that applyAuthorStyles might be removed any time soon. So this will not be an all-time solution.
Bug report: https://code.google.com/p/dart/issues/detail?id=18581