jQuery Pocket Reference
by David Flanagan
Published: December 28, 2010
Concise but information-rich: an introduction rather than a reference book.
It seems fitting that for a lightweight library like jQuery, there should be a lightweight manual perched next to your keyboard. And jQuery Pocket Reference does the job perfectly. Its author David Flanagan (of the Java In A Nutshell fame) does a remarkable job of distilling the details into the book's 130 or so pages, while keeping the whole thing readable.
And the paperback's diminutive size has some unseen benefits...