I'm just keeping a really close eye on my bank account, like always. But just to be on the safe side - I'll probably end up canceling the card and just getting a new one anyway. I already changed my password through the only thing I really use my PS3 for that involves any card information, and that's Netflix. It was time to change up my passwords anyway.
I don't really think it's that big of a deal, as long as you keep an eye on your funds and what-not, like you should always do,... regardless of the situation. I don't think a minor hassle like changing your card justifies trying to squeeze a ton of money out of the situation. Just seems greedy to me. Oh well, that's my opinion.
I just hope this all ends quickly, and everyone stops talking about it. Hey, I can dream, can't I?