http://jashkenas.github.com/coffee-script/

* Python-style significant whitespace to delimit blocks (no more periods).

* Better conversion of JS statements into expressions -- you can pass a try/catch right into a function, for example (not that it's a good idea).

* Splats, for variable numbers of arguments in function definitions and function calls.

* Object and Range comprehensions, to augment the existing Array comprehensions.

* A Ruby-style block syntax for passing functions as the final argument.

* The existence operator, which returns true if a variable is not null or undefined.

* All functions are named functions, to help ease debugging.

* Array splice literals, to complement the array slice literals.

All of your feedback from the previous post has really helped shape the language. I'd love to hear more.