[quanticle]

So how is this better than CoffeeScript (http://jashkenas.github.com/coffee-script/)?

[macco]

I don't think if it is better, but is a bit more suited to Python-programmers.

[wkornewald]

Exactly. The less mode/context switching you have to do the less stupid syntax mistakes you can make. We made this because we use Python for server-side code and we also want the same language for browser-side code.