Just in case you use Chase Bank or Citi Bank:  They have had some problems, so you might want to find out about what is taking place.  From what I gather, be care with emails you get from these companies

Think twice next time you get an email from Chase or Citi asking you to log in to your credit card account. The bank may not have sent it.

(via Targeted nature of email breach worries experts - Yahoo! Finance.)