Compact introduction to jquery,
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This review is from: jQuery Pocket Reference (Paperback)
Naturally you aren't an expert after reading this, but it does contain a lot of information about various aspects of what jquery can be used to do and how.
It gives a good introduction to these different uses of jquery, and is good for looking up things or getting a taste of what jquery can do for you.
I still use it to quickly look something up if I'm in doubt.
So all in all, a great look into the world of jquery. But you need a more detailed/longer book to make yourself a jquery expert.