Tom Marrs is giving a session on JQuery at work.
How to get started with JQuery :
http://www.sitepoint.com/ : WebDesign for developers.
Some Caveats :
2) Prefer External Styles
3) Just enough CSS --> Tag , Class & ID selectors, Descendent/combination selectors
How to iterate, How to navigate the dom, utility methods.
Ajax : $.ajax
JSON : Lightweight $.getJSON
JQuery Widgets : DatePicker, Accordion, Tabs, Dialog Box, Auto complete,Tool tip, JGrowl