for the sake of clarify
should be
for the sake of clarity

wait five seconds a web page
should be
wait five seconds for a web page

Application developers are usually _interesting_ in supporting as wide a user base as possible.

should be

Application developers are usually _interested_ in supporting as wide a user base as possible.

Code as syntax errors.

should be:

function $(id) { return document.getElementById(id); }

window.onload = function() {
$("sandbox").innerHTML = "Click here!<br/>";
$("sandbox").onclick = function(ev) {

ev = ev || window.event;
$("sandbox").innerHTML = "Clicked at " + new Date() + ". Event: " ;

for (property in ev) {
var message = "Property " + property + ": " + ev[property] +
"<br/>";
$("sandbox").innerHTML += message;
}
};
}

Author's note: Readers can also refer to the corresponding code example in
http://ajaxify.com/tutorial/dynamic/tutorial.js - They will find at that
location the code as it should read.

The choice is between
should be
The choice between

this pattern is a like
should be
this pattern is like

already disabled a available
should be
already disabled available

the web site should be www.serversideguy.blogspot.com.

those homes one the other side
should be
those homes on the other side

"corresponding mozilla.org article" is repeated

can be easily be
should be
can be easily

It fetches is the counter XML:
should be
It fetches the counter XML:

The Assitive Search
should be
The Assistive Search

is outputted
should be
is output

particularly gamin
should be
particularly gaming

Portlest
should be
Portlets

while perform work
should be
while performing work

aOne-Second
should be
a One-Second

"One-Second Mutation" should be italicized like the others.

thePortlet
should be
the Portlet

polling ithis
should be
polling this

is embedded an
should be
is embedded in an

(last page) colophon;
The colophon for Ajax Design Patterns currently says that the cover
image is from Cassell's Natural History. It should actually say that it
is orginal art by Mike Kohnke.