The only safe prediction to make is that you really can't predict things.
Still, people keep making predictions. Now there's Wrong Tomorrow, a Web site that attempts to hold feet to the fire for pundits, authors, politicians and anyone else so sure of himself or herself that a prediction might spout forth. Among the big boo-boos:
"Two years from now, spam will be solved." - Bill Gates in 2004.
"We could be looking at $10-a-gallon gas this winter." - Matt Simmons, 2005