Passive vs. Active, Employed vs. Unemployed

I posted this question at Linked In, and received some very interesting responses. I thought my blog readers might like to join in with their thoughts as well …

The overriding theme by internal recruiters at the recent Kennedy Conference was the desire to primarily (and preferably) recruit passive candidates (those who are happily employed and not looking).

So my question is, if you knew that your marketability as a candidate would spiral the moment you became unemployed (even through no fault of your own), what would you do differently today to manage your career for the future?