Best way to learn javascript is to type CTRL+SHIFT+I(in chrome I think its f12 in others) and look at the code. Chrome will even de-obfuscate it for you automatically. Step through the code, maybe write some script in the console, go through some resig tutorials.

I really liked looking at the underscore.js literate source but thats a little more theoretical than practical.

Also if you are just learning javascript you might as well learn jQuery because it will do a huge chunk of your basic practical needs. If you are learning javascript to really understand the language or build something super complex you may wanna watch the crockford videos and understand prototypes and those things. Otherwise jQuery will probably cover you.