I took a book from the Wrox press, Getting started developing Javascript and CSS using jQuery . I liked it because the code examples do not handle jQ in a vacuum, they include all html, css and scripts for implementing relatively complex ui elements, cross-browser CSS hacks and all.
For example, it creates a clone of the OS X Finder with drag and drop "files" and shows how to create all the behaviors that the Finder executes. Select, drag and drop to folders, etc.
Once you understand the basics of how jQuery does things (selectors / traversal, implicit loop, chaining methods, event handling, how this handled), you can move from n00b to pretty quickly. Everything goes well and the online documentation is great.
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