With all the tools you need to learn the language, practice using it, and answer implementation questions right on the site, for those who already know JavaScript, there's really not much else you need or could ask for.
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Pros
Pro Provides an in-browser interpreter so you can practice while you learn
The site also provides an interpreter right on the page, which will let you run CoffeeScript in your browser, and show you the equivalent JavaScript as you type.
Pro Excellent resource for those already familiar with JavaScript
If you're already familiar with JavaScript, The official CoffeeScript website is an excellent resource for picking up CoffeeScript - the main page provides a quick reference for all of the language's features, complete with examples, side-by-side with their JavaScript equivalents.
Pro Provides clearly annotated source
If you're the type who likes to really dive into the details of the tools you use, the CoffeeScript website also provides clearly annotated source for the language itself, to clear up any questions you might have.
Cons
Con Site design/format can be hard to follow
All the content is listed on one web page, with very little white space breaking lessons apart. It can be a bit difficult to follow.
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