Just thought I’d add another one to the list…

Include your résumé, preferably a full résumé with all your work history on it (not one suited to a particular job opening or field). Include all starting and ending dates, starting and ending salaries, and reasons for leaving (or positive substitutes for those reasons for leaving). Most résumés do not include all that information, but job applications ask for them, so you should have it stored somewhere.

Additionally, services like Monster.com and Yahoo! HotJobs let you store résumés online, which may replace or supplement the advice above.

Keep in mind, disasters like company downsizing and layoffs are just as devastating, sometimes more, than earthquakes, tornadoes, etc.