Been using jQuery for a few years on and off and figured it was about time I got a book a really learned what it's all about. I had a quick look and got jQuery: Novice to Ninja for my Kindle. I'm about 15% of the way through and finding it all very interesting, like when CSS first clicks!

For instance my biggest problem with javascript has always been making script work on different browsers (traversing the DOM in IE, nightmare) but jQuery selectors allow me to select any class, id or element and use it, just for that I'm going back to all my old scripts.