This week's book giveaway is in the OO, Patterns, UML and Refactoring forum. We're giving away four copies of Refactoring for Software Design Smells: Managing Technical Debt and have Girish Suryanarayana, Ganesh Samarthyam & Tushar Sharma on-line! See this thread for details.
The jQuery online docs are really good -- especially for online documentation. But they aren't exactly a tutorial that you can read through (sort of like trying to learn English by reading the dictionary).
I don't know of any thorough tutorials available online. But there are lots of blog posts you can search for that have mini-explanations of performing certain tasks.
Chapter 1 of jQuery in Action is a free download available here. It should at least give you a good overview of jQuery.