See
http://news.cnet.com/8301-30685_3-20117924-264/google-debuts-dart-a-javascript-alternative/

Also
http://googlecode.blogspot.com/2011/10/dart-language-for-structured-web.html

&

http://www.dartlang.org/
http://www.dartlang.org/docs/getting-started/

Google's posting:

<<..Today [on Monday] e are introducing an early preview of Dart, a class-based optionally typed programming language for building web apps.
...
The language comes with a set of basic libraries and tools for checking, compiling, and running Dart code, all of which will evolve further with your participation..>>

[meta]:
Why the word 'p p l', part of a very common word 'app li ca tion' etc. is blocked here?
Why? Why???

Sorry, let me unblock that!

Thanks!!