For now it's more a "proof of concept" than something usefull.
Click [here] to try the working sample...
If you ask yourself what the f*** is Dart - then click [dartlang] for more informations about this great new language from Google.
Right now (03 23 1212) this sample throws an error (Uncaught TypeError: Cannot call method 'apply' of undefined) in Chrome or Firefox but works in Chromium. You can see the bug if you click on the "Launch demo modal" button. - Nothing happens, instead the error is thrown.
Bug is already filed at issue-tracker
If this sample is helpful for you - please (Circle) me.