Today sony released a statement on their official blog saying that whoever caused the malicious attack might have obtained your credit card info. Thank god I only used prepaid cards when I had my psp.
http://www.engadget.com/2011/04/26/sony-provides-psn-update-confirms-a-compromise-of-personal-inf/
http://www.engadget.com/2011/04/26/sony-provides-psn-update-confirms-a-compromise-of-personal-inf/