Judging by the emails I'm getting and the chatter over on Apple's support forum, there seems to have been a huge increase in hack attacks on iTunes accounts.
Accounts containing credit card details, those linked to a PayPal account and those with a gift certificate balance seem to have been hit. Many accounts with a gift certificate balance have been virtually cleaned out.
The name Kingdom Conquest seems to be coming up often in reports, either as the app being purchased or the app being used to make fraudulent in-app purchases.
F-Secure's chief research officer Mikko Hypponen believes that it is 'unlikely' that all these hacks were carried out with the use of keyloggers.
Might be worth checking your iTunes account if you have one, and harden any poor quality passwords.