so more and more is coming to light on the huge PSN breach. It looks like ALL 77 million accounts were in some way compromised. Sony is not totally sure yet what data was captured, but name, address, password, and credit card information could be out there. At some point sony was saying that credit card numbers were encrypted, but i have not since heard this so i'm not sure anymore. no mention was made on the password security.
for the paranoid out there (/me puts on tin foil hat) you should probably at least change some passwords (if you use similar passwords on psn as on gmail for example) or even request a new credit card.