If you have any interest in keeping your various online accounts secure; or the computers in your company secure, then read this account of how a high-profile firm that specialises in IT security failed big time to practice IT industry security recommendations.
HBGary's servers were broken into, its e-mails pillaged and published to the world, its data destroyed, and its website defaced. As an added bonus, a second site owned and operated by Greg Hoglund, owner of HBGary, was taken offline and the user registration database published.
Most frustrating for HBGary must be the knowledge that they know what they did wrong, and they were perfectly aware of best practices; they just didn't actually use them. Everybody knows you don't use easy-to-crack passwords, but some employees did. Everybody knows you don't re-use passwords, but some of them did. Everybody knows that you should patch servers to keep them free of known security flaws, but they didn't.