"For some time now the PlayStation 2 has held the mantle of best-selling video game hardware ever. As of last September the PS2 weighed in at over 140 million units sold. According to NPD analysts, however, that reign may be coming to an end compliments of the Nintendo DS.
Since its launch in 2004, the Nintendo DS has enjoyed massive success across four versions of the handheld. As of last March the DS has shipped nearly 130 million units, making it barely in reach of the PS2."