The ongoing news about the and the job market hasn't been encouraging. Companies are taking a much closer look at their operating expenses, especially their payrolls. Writer Stephen Viscusi asserts that in this atmosphere, "You must understand that your job is your most valuable asset -- and your primary objective is to protect it." That's just part of the advice he outlines in his book "Bulletproof Your Job: 4 Simple Strategies to Ride Out the Rough Times and Come Out on Top at Work." Viscusi's book discusses tactics for being visible, easy, useful and ready in order to keep one's job.