These freely available websites provide information about salaries for many hospitality-related jobs.
Salary.com
Salary.com is one of many examples of free (and partially free) web-based salary survey services. Provides limited salary information based on position (some hospitality positions) and geographic location.
PayScale reports median salaries by years of experience, employer type, by job, by yearly sales, gender, and location. It also reports median hourly rates, vacation time, commissions, bonuses, commute time and more for various hotel positions.