I recently gave two talks on Dart, one at reflections projections|2012 at the University of Illinois at Urbana-Champaign and one at DevOps Live in Plano, Texas. Both of them were recorded. The DevOps Live talk is slightly newer since I updated it for the M1 release of Dart. If you've never seen one of my introduction to Dart talks, now's your chance!
Ad maiorem Dei gloriam inque hominum salutem.