Hmm, I'm not agree. The main goal of Ruby in JavaScript (for me) is

1 absence of the mental shift
2 better syntax
3 better OO support
4 better STD lib

The js.class solves only one from this problems - the 3th.

By the way there is also another project - CoffeeScript 
http://jashkenas.github.com/coffee-script/
It solves 2, 3 and partially 4, but not the first one.
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