I've got the dart-sdk, updated my path to include the dart binaries, downloaded the tutorials and grabbed its dependencies by running "pub get". I'm going to lean toward using dart2js until dartium integrates fully with chromium, and using
dart2js clickme.dart -o clickme.dart.js
works fine from Firefox (I'm working in vim and not the Dart Editor or Spark).
But tutes using polymer don't include a main() so dart2js won't compile them. I'm not sure how to proceed. I don't know how to create an instance of TuteStopwatch, which extends PolymerElement, which might be used to create a main(), for example.