Reddit reviews Professional JavaScript for Web Developers (Wrox Professional Guides)

I can't tell you anything about Code Avengers, but the Codecademy course, even after the major overhaul they did to improve it, the javascript courses(and a lot of the other courses, but we'll leave those out) are still lacking in my opinion. Some are just soooo awfully written that you're forced to go to the Q&A section to just copy and paste and answer. Even on the courses that were understandable and worked alright, they were monotonous and I also feel that some of the lessons were stretched out for some reason; perhaps for fear that the information wouldn't stick.

However, I don't think that sites like that should necessarily be used for learning; I'd rather point you to books such as this and video tutorials for really learning the language. Sites like codecademy are positively wonderful for review; I doubt there's a more engaging way of reviewing and fine-tuning your mind for programming other than actively using the language, which is what really makes a programmer.

Proof of my account

Professional JavaScript for Web Developers. Zakas is one of the best.

Buy a book or books that have been published relatively recently.

I recommend

http://www.amazon.com/CSS-Mastery-Advanced-Standards-Solutions/dp/1590596145/ref=sr_11_1?ie=UTF8&qid=1218481072&sr=11-1

and

http://www.amazon.com/Professional-JavaScript-Developers-Wrox-Guides/dp/0764579088/ref=pd_bbs_sr_1?ie=UTF8&s=books&qid=1218481458&sr=1-1

There might be better javascript books out there however, as it can get rather quirky. Learning a framework like Jquery is also a plus.

You could also poke around on http://www.crockford.com/