The official website of Dart where you can download and learn more about it.Dart Mailing List
If you would like to receive help by mail, this is the place.Official G+ Community
A community which you need to join to get official and sometimes not so official communication on Dart.Dart Announce
G+ page for Dart related announcements.Dart on StackOverflow
The wellknown community StackOverflow also has some answers waiting for you.
Website for the book with the same name, containing tons of Dart examples.
You think you have a great resource/website for us? Let us know by writing to firstname.lastname@example.org