Think you're grossly underpaid? Check out Salary.com to find out for sure. (Just refrain from doing so while you're at work.) The company's website provides the Salary Wizard, which offers employee compensation data and analysis geared toward individuals, managers, and businesses. Other tools include a Cost of Living Wizard, Benefits Wizard, Performance Self Test, and Job Assessor. The firm provides employer-reported data on more than 4,000 job titles. Salary.com also operates Salary.com for Business (at http://business.salary.com), a separate site that offers articles, tips, and tools for companies. Most revenue comes from advertising. Salary.com is a division of human resources firm Kenexa Corporation.