Its a good thing I don't have a PS3... oh crap, my PSP. >.< Damn you sony!
Glad I never entered my card info there. And now I'm even more reluctant to put it there in the event that I'm tempted to buy a downloadable game.
Raises a good point, though. We sort of take it for granted that our info is secure, but even banks get hacked and they have waaaay more money to spend on security than video game companies do. Maybe even more money than Bill Gates!
And Valve? Oh, right, they never release their sales data, my bad!
Always good practice to routinely check your balance aside from the monthly statements.