Each year, the final Friday of July is System Administrator Appreciation Day. This year, that day is July 25th, 2008.
What is a "system administrator"? In short, he is the person in charge of maintaining all the computers, computer networks, and related equipment, running smoothly at a business, school or other organization. He is typcially a member of an organization's information technology services department, though at small organizations he may be that department.
Learn more about the day at the official System Administrator Appreciation Day web site: http://www.sysadminday.com/ .