Anybody who has used Steam from the years of 2004-2008 and has purchased a game through steam needs to watch their bank account carefully. From Steam:
"Dear Steam Users and Steam Forum Users
We continue our investigation of last year's intrusion with the help of outside security experts. In my last note about this, I described how intruders had accessed our Steam database but we found no evidence that the intruders took information from that database. That is still the case.
Recently we learned that it is probable that the intruders obtained a copy of a backup file with information about Steam transactions between 2004 and 2008. This backup file contained user names, email addresses, encrypted billing addresses and encrypted credit card information. It did not include Steam passwords.
We do not have any evidence that the encrypted credit card numbers or billing addresses have been compromised. However as I said in November it's a good idea to watch your credit card activity and statements. And of course keeping Steam Guard on is a good idea as well.
We are still investigating and working with law enforcement authorities. Some state laws require a more formal notice of this incident so some of you will get that notice, but we wanted to update everyone with this new information now.
Gabe"
Source:
Steam Hacking Update: Hackers Obtained Credit Card Info, But Not Passwords - G4tv.com 
Attention: Steam Credit Card Info Stolen 2004-2008 
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