http://www.techcrunch.com/2009/07/19/the-anatomy-of-the-twitter-attack/

The first step of registering an old email account to receive the password from a current account was a nice and easy way to break into an email acount. After that, things pretty much fell like dominoes, but it's nice to see how inconspicuous a smart attacker can be. This story also reminds us the painful fact that the only way you can know about some security breach is if the attacker is destructive, or less skilled, or wants you to know. The victims of this attack could have spent the rest of their lives without knowing that their information is being monitored.