Whysoserious.com/Overture
Beating the puzzle at Whysoserious.com/Bamboozle/2l43kjsa892nn2.htm brings up Whysoserious.com/Overture. The site depicts the "reaper" bomb from Whysoserious.com/l_flave2323, but this time with a countdown to 10 PM EDT on July 10, 2008.
July 10, 2008
After the detonation time expired the website revealed this.
Clicking on making my mark led to the Citizensforbatman.org page
After getting to the home page, clicking on the live cameras in New York and Chicago where a live broadcast of the Batman signs were shown. After a couple minutes, the Batman sign deteriorated and a bunch of "HAHAHAHA" were made into the shape of the batman sign.