Web Standards Archives - THEMWEBS
One cool place to start in order to get the basics down, would be here: http://www.learningjquery.com/
We are already using some of the widgets on our sites, Reurnert, King pie, Bidvest Intranet (most recent).
In an effort to learn how to implement jQuery UI widgets I had created this test suite. http://element.co.za/sandbox/jqui/accordion.php it is an exact replica of the jQuery UI website test suite http://jqueryui.com/demos/accordion/
The aim behind it was to build each widget one by one. Replicating what they had on their website, so that i could learn how to do it. Please download your copy of the element test suite and add your own pages, play around with the code so that you can get to grips with it.