@SteveRichter: I'm not sure it's not a big deal, as many folks use Script# today. Dart represents a new programming language (and model) for building applications for the web (this includes running on the client and the server). Dart is an approach to try something new, to start from the ground up, with a new language, compiler, runtime and framework. The design is informed by the web (and what the language designers see as missing from current tools like JavaScript). I haven't spent much time with Dart so that about sums up my understanding it.

C