^^^ i'm still fuzzy on the whole good bad thing.
all our personal info is stolen though - so uhh identity theft? setting up other accounts, applying for loans, i dunno?
When you sign up for a PSN account are you required to give date of birth?
on the other hand change your c/card details and a couple of passwords and its all good?
I think they'd need a little more than name/address/dob to apply for a loan, although I'm not sure what. I think you are required to give a DOB.
Most likely what they'll do is use the information they have in phishing attempts, making out that they are your bank/Sony/facebook/email provider/ISP/ebay/paypal etc. because only a trusted organisation would already have your name/address/dob etc.