Some 15 to 18 million people played in fantasy leagues this year, up from 4 million in 2000, according to the Fantasy Sports Trade Association.

FORBES: Picking Winners

It is estimated by the Fantasy Sports Trade Association that 32 million people aged twelve and above in the US and Canada played fantasy sports in 2010.

FORBES: Fantasy Football Madness

Football is by far the most popular fantasy sport, with nearly three-quarters of the 29.6 million fantasy players in the U.S. participating, according to the Fantasy Sports Trade Association.

WSJ: CBS Opens Sports Site to Fantasy App Makers