http://jquery.com/
http://github.com/jquery/jquery
http://weblogs.asp.net/scottgu/archive/2009/09/15/announcing-the-microsoft-ajax-cdn.aspx
http://www.andy-gibson.co.uk/
http://encosia.com/
For a more in-depth read on jQuery functions, I don't think you can do much better than jQuery in Action by Bear Bibeault and Yehuda Katz, published by Manning.
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