The Security Mentor

In your (ha!) free time you could look through security firm Watchguard's list of computer security fundamentals.

A lot of the recommendations end up with telling you to buy Watchguard equipment, which you can't really blame them for. But they do offer down-to-earth explanations of what threats you face in the real world, why an obscure small-to-medium business might be attacked, and what someone thrust into the "micro-CTO" role should do to manage a network.