A list of types of threats, organized by target area, summarizing:

    - each threat
    - its basic mechanism
    - basic effective defenses
    - common ineffective defenses
    - tradeoffs between more effective and less effective defenses
    - possible stopgaps until you can use an effective defense
    - where to start to learn more about each.

Sort of a Zagat's of security.

I would also like to see evo_9's How to Secure Your Life, described in his comment.