Comment: Starts with the right foot and finishes with the wrong one. Enjoyable at the beginning, this O'Reilly book loses nerve ongoing; moreover, the last chapters are jokes-free (what's an O'Reilly book without jokes?). The cover says "with AJAX" but the book covers AJAX.NET just briefly, so if you're looking for an AJAX training this is not the book for you. If you know VB.NET/C# and you're looking for something to introduce you to the ASP.NET world (including AJAX) this might be the right option. Again, without knowing a little VB.NET/C# the reading wouldn't make much sense.
"AJAX DOESN'T EXIST"
was by Jesse James Garrett in February 2005. Garrett thought of the term
while in the shower (if you must know), when he realized the need for a shorthand term to represent the suite of technologies he was proposing to a client (who, we are assured, was not in the shower with him)."