Almost like it’s Christmas, a plethora of tutorials!
http://www.smashingmagazine.com/2007/06/20/ajax-javascript-solutions-for-professional-coding/
http://www.smashingmagazine.com/2008/10/16/50-excellent-ajax-tutorials/
http://www.smashingmagazine.com/2008/09/11/75-really-useful-javascript-techniques/
http://www.smashingmagazine.com/2007/01/19/53-css-techniques-you-couldnt-live-without/
Happy holidays,
Atg