Online security has become a growing concern for many users on the internet, and Amazon is adding fuel to the flames with an email sent to some customers today. The message in question informs users that their name and e-mail address were exposed due to a "technical error", though the problem has since been fixed.
Aside from that, Amazon didn't go out of its way to provide many more details about what happened. Thankfully, it would seem that more sensitive information such as passwords or physical addresses weren't disclosed, and as such, Amazon says you don't need to reset your password. Typically, these kinds of emails warn users to do so, even if such information wasn't directly exposed, so it may still be a good idea to do so.
There's no shortage of examples where companies expose their customer's private data for one reason or the other. Google was recently involved in one such scandal which actually drove the company to shut down it social network, Google+, entirely. At least Amazon is informing its customers of the issue, even if it hasn't provided any details such as how long this information was visible to others.