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