You need to realise that SCWCD is focused on the
server-side while AJAX is (fundamentally) a client-side technique - okay, AJAX systems obviously communicate with the server, but most of the AJAX you'll learn will be utilising JavaScript to pull data from the server into a browser, rather than what happens on the server itself... if you see what I mean
So no, nothing to do with AJAX in the SCWCD exam. Quite what happened to Sun's Q1 2009 plans for a Certified AJAX Developer exam I don't know either. They might have gone, along with the leaving of the then-programme-coordinator.
Charles Lyons (SCJP 1.4, April 2003; SCJP 5, Dec 2006; SCWCD 1.4b, April 2004)
Author of OCEJWCD Study Companion for Oracle Exam 1Z0-899 (ISBN 0955160340 / Amazon Amazon UK )