The picture of the guy on top of the WTC is faked, see:
http://www.truthorfiction.com/rumors/lastpic.htm
A computer related message board decided to take the concept and run with it, with amusing results (waldo just keeps popping up _everywhere_)
http://www.hardforum.com/showthread....ighlight=Waldo
-or-
digested down to just the pictures,
http://mmx.bootlab.net/waldo/