Tutorial walks through some of the key (and more useful) concepts for working with jQuery:

http://dotnetslackers.com/articles/ajax/JQuery-Primer-Part-1.aspx

[2 Cents] Wish I had this 2 years ago when I was scraping for some basic info. Nice, succinct intro to the stuff in jQuery that can get you productive pretty quick. Sheesh, does anyone still write friggin getElementByID() stuff anymore other than library developers? Ha! Looking forward to Part 2.