http://www.nextgov.com/nextgov/ng_20110429_3808.php?oref=topstory
As far as the scale of Sony's customer account break-in, the PlayStation hack is outranked by two recent invasions. An intrusion at TJX Companies Inc. that was reported in 2007 exposed data from more than 94 million credit and debit cards belonging to consumers who had shopped at TJ Maxx, HomeGoods, A.J. Wright and Marshalls stores. In 2009, an incursion at Heartland Payment Systems Inc., which processes debit and credit card transactions, compromised about 130 million cards.