Ajax – the coding part

An introductory tutorial by Jonathan Fenocchi:

http://www.webreference.com/programming/javascript/jf/column12/index.html

Ajax explained in non technical terms

by Joshua Porter:

http://www.uie.com/events/uiconf/articles/ajax/

Ajax good? Ajax bad? More debate…

http://www.johnniemanzari.com/archives/2005/05/ajax_99_bad.html

…about ajax, flash and other evils of the day.

Javascript with XMLHTTPRequest – an example

Fade Away News Viewer from Eric Pascarello

A whole bunch more from fiftyfoureleven.com