In any office, there is a power structure.  A hierarchy of influence that when properly navigated can make your work life and career a heck of a lot easier.  There are key people in any work environment that if you befriend, will provide support and assistance in getting critical tasks accomplished.  The thing is, these key people are almost definitely NOT the layer of management above you.  They're the support folks who make the world function.

Support, maintenance, mailroom and receptionist/office assistants.  These are the people that can make or break your day.  If you are on their good side, they will go out of their way to help you when you need it most.  Treat them like dirt (as many people do to support staff) and don't expect any service request to be done in a remotely timely fashion.  Basically, there's no one in your organization that is "beneath" you, since at some point you will likely have to rely on them to get the job done.

Wired has a nice list of Dos and Don'ts for getting on the good side of the office support staff.