This Time article puts JW in the same company as Harold Camping.
http://www.time.com/time/nation/article/0,8599,2072748,00.html
Throughout history, movements like these have sprung up, especially in times of war or economic and political instability.
"When you think your world is going to hell in a handbasket, it's comforting to say, 'The world is bad, but God will take me out of this,'" says Doug Weaver, an associate professor of religion at Baylor University in Waco, Texas, who teaches the history of Christianity.
To that end, apocalyptic movements have surfaced in almost every era of chaos: following the Great Fire of London in 1666, for example, or during the U.S. Civil War in the 1860s.
The outbreak of World War I unleashed a torrent of end-of-the-world predictions: Charles Taze Russell, founder of the Jehovah's Witnesses, predicted the second coming of Christ would occur in 1914, which he said would mark the end of time for nonbelievers.