the crockford book is really good, but in reality the best thing is practice. javascript is a tricky language, and crockford helps to simplify it, but you can

the crockford book is really good, but in reality the best thing is practice. javascript is a tricky language, and crockford helps to simplify it, but you can get a lot of practical knowledge on how to use the language and jquery just by practicing a lot (sorry). but read crockford too :P also heard an oreilly cookbook for js is coming out soon, may be worth looking into if youre into those.