pple said today that about 400 of the 150 million iTunes accounts was hacked today by an unscrupulous developer. If you've put your credit card info in your iTunes account, you might want to check for unusual charges and at the very least, change your iTunes password.
The Wall Street Journal has the full report of what happened. According to Apple developer Thuat Nguyen had been writing and selling comic books apps in the App Store. Sales were so good his books were dominating that section of the store.
Apple discovered the fraud after a number of customer complaints that their iTunes account had been compromised and that there were suspicious charges on their credit cards. While the full extent of Apple's actions aren't known, one change that has been made is you'll have to re-enter your credit card information more often.