Just when we were starting to trust again, Nyleveia.com has revealed an exploit on Sony's official PSN website that could potentially allow unscupulous users to change a PSN account password simply by providing a valid user name and date of birth. Both of which, as you know, were compromised as part of the stolen personal information gleaned by the hackers behind the recent PSN outage. Nyleveia apparently contacted Sony as soon as they discovered the exploit, and the password page is now down for maintenance at the time of writing.
Several larger sites have confirmed the story after reviewing video evidence.
Before you start boarding up your doors and windows in a fit of paranoia, note that this exploit may not have been used - and thanks to the heads-up, now definitely won't be. The exploit also doesn't affect PS3 consoles, which still provides the most secure way of changing your password. However, it's the last Sony needs right now, as regaining consumer confidence is absolutely critical over the next few days.
Be sure to change the email address associated with your account just in case.